Home

1746-UM003A-EN-P, SLC 500 RTD/Resistance Input Module

1. NR8 5Vdc 24V dc IM e 0035 l IA8 e 10 050 IA16 e 10 085 IM4 e 10 035 IM8 e 10 050 IM16 e 10 085 0A8 10 185 OA16 0 370 OAP12 0 370 IB8 e 10 050 IB16 e 10 085 1B32 e 10 050 ITB16 e 10 085 IV8 e 10 050 IV16 10 085 IV32 10 085 ITV16 e 10 085 IC16 e 10 085 1G16 e 10 140 IH16 e 10 085 OB8 e 10 135 0B16 e 10 280 0B32 Series D or later 0 190 OB16E e 10 135 OBP8 e 10 135 OBP16 e 10 250 0G16 e 10 180 OVP16 e 10 250 OV8 e 10 135 0V16 e 10 270 OV32 Series D orlater 0 190 IN16 e 10 085 l OW4 e 10 0045 0 045 OW8 e 10 085 0 090 OW16 0 170 0 180 OX8 e 10 085 0 090 104 e 10 030 0 025 108 e 10 060 0 045 1012 e 10 090 0 070 NI4 e 10 025 0 085 NI8 0 200 0 100 NI16l e 10 125 0 075 NI16V e 10 125 0 075 NIOAI 0 055 0 145 NIO4V e 10 055 0 115 FIO4I e 10 055 0 150 FIO4V e 10 055 0 120 NOAI 0 055 10 195 NO4V 0 055 10 19 NT4 e 10 060 0 040 NT8 e 10 120 0 070 INT4 e 10 110 0 085 NR4 e 10 050 0 050 HSCE e 10 320 HSCE2 e 10 250 BAS e 10 150 0 040 BASn e 10 150 0 125 KE e 10 150 0 040 KEn e 10 150 0 145 HS e 10 300 HSTP1 e 10 200 Publication 1746 UM003A EN P Place your RTD module in any slot of an SLC 500 modular chassis except slot 0 or a modular expansion chassis Slot 0 is reserved for the modular processor or adapter modules Fixed Expansion Chassis Considerations IMPORTANT The 2 slot SLC 500 fixed I O expansion chassis 1746 A2 support
2. 1 The accuracy values assume that the module was calibrated within the specified temperature range of 2 Temperature drift specifications apply to a module that has not been calibrated 3 The digits following the RTD types represent the temperature coefficient of resistance cc which is defined as the resistance change per ohm per C For instance Platinum 385 refers to a Platinum RTD with 0 00385 Q Q C or simply 0 00385 C 4 Actual value at 0 C is 9 0420 per SAMA standard RC21 4 1966 5 Actual value at 0 C is 100Q per DIN standard Publication 1746 UMO003A EN P 0 C to 60 C 32 F to 140F Specifications A 5 Resistance Device Compatibility Table A 1 Resistance Input Specifications Input Type Resistance Range Resistance Range Resolution Repeatability 0 25 mA Excitation 1 0 mA Excitation 28 Hz 50 60 Hz Resistance 150Q 0 to 1500 Q 0 012 0 04Q 500Q 0 to 500Q Q 0 1 02Q 10000 0 to 10000 Q 0 1Q 02Q 30002 0 to 30000 Q 0 10 02Q Cable Specifications Description Belden 9501 Belden 9533 Belden 83503 When used For 2 wire RTDs and potentiometers For 3 wire RTDs and potentiometers For 3 wire RTDs and potentiometers Short runs less than 100 feet and Long runs greater than 100 feet or normal humidity levels high humidity levels Conductors 2 24 AWG tinned copper 7x 32 3
3. Configuration error Bit 15 Check and correct the set 1 configuration word for this channel Out of range error indicating that either an Yes over range or under range Bit 14 condition exists For all End pel _ over range the input signal Is problem set 1 is greater than the high corrected scale limit for the channel For under range the input signal is less than the low scale limit for the channel A broken input error or Contact your short circuit RTD Contact your local distributor Bit 13 nn es local distributor or Rockwell i r Rockwell set 1 or Rockwe A tomati n 1 connections RTD and Publication 1746 UM003A EN P potentiometer inputs and check channel for short circuit condition RTD only Retry Automation Replacement Parts Contacting Rockwell Automation Module Diagnostics and Troubleshooting 6 7 The RTD module has the following replaceable parts Table 6 3 Parts List Part Part Number Replacement Terminal Block 1746 RT35 Replacement Terminal Cover 1746 R13 Series C 1746 NR8 User Manual 1746 UMOO3A EN P If you need to contact Rockwell Automation for assistance please have the following information available when you call a clear statement of the problem including a description of what the system is actually doing Note and record the LED states also note input and output image words for the RTD module a list of things you hav
4. bit allocation 4 5 in configuration word 4 5 broken circuit defining conditional state of channel data downscale enable 4 76 upscale enable 4 16 zero 4 16 broken input bit description in configuration word 4 16 bit description in status word 4 22 broken input error bit description in status word 4 23 C cable specifications A 5 cable tie slots 1 6 calibration auto cal 2 15 factory cal 2 15 single point 2 76 channel configuration error 6 4 bit description in status word 4 24 definition G 7 channel status bit 4 23 bit description in status word 4 23 channel timing channel scan time 3 10 channel update time 3 10 chassis G 1 CMRR G 1 common mode rejection ratio G 1 common mode voltage G 1 Index compatibility 1 3 configuration word 3 4 G 1 factory default setting 4 3 worksheet B 1 configuring a channel worksheet B 1 contacting Allen Bradley for assistance P 3 current consumption 2 3 cut off frequency 3 7 G 1 D data word G 1 data word format 4 6 bit description in configuration word 4 6 bit description in status word 4 22 dB G 1 decibel G 1 default setting of configuration word 4 3 definitions G 1 diagnostics 6 1 differential mode rejection See normal mode rejection G 3 digital filter G 2 disabling a channel 4 17 door label 1 6 E effective resolution definition G 2 electrical noise 2 5 enabling a channel 4 17 bit description in configuration word 4 17 engineering units input 4 6 error code
5. 120 Figure 3 5 800 Hz Filter Frequency Response GAIN dB ELLI ee aa ea ft L 4 1 1 l 0 272 538 804 1070 1336 1602 1868 2134 2400 FREQUENCY Hz Publication 1746 UMOO3A EN P Preliminary Operating Considerations 3 9 Figure 3 6 6400 Hz Filter Frequency Response GAIN dB 0 O 2136 4269 6402 8535 10668 12801 14934 17067 19200 FREQUENCY Hz This section shows how to determine the channel update time and channel autocalibration time In addition the scanning process is briefly described The RTD module channel update time is defined as the time required for the module to sample and convert scan the input signal of an enabled input channel and make the resulting data value available to the SLC processor for update Publication 1746 UM003A EN P 3 10 Preliminary Operating Considerations Publication 1746 UMOO3A EN P Channel Autocalibration Upon entry into the channel enabled state the module configures that channel and performs an autocalibration on the module if the combination of input and excitation current are unique to that channel Module calibration takes precedence over channel scanning Module calibration time is dependent on the number of unique input type and excitation current combinations and is equal to 510 msec 125 msec x number of unique combinations Update Time and Scanning Process The illustration on page 3 11 shows the scanning process f
6. 24 AWG tinned copper 7x 32 3 24 AWG tinned copper 7x 32 Shield Beldfoil aluminum polyester shield Beldfoil aluminum polyester shield Beldfoil aluminum polyester shield with copper drain wire with copper drain wire with tinned braid shield Insulation PVC S R PVC Teflon Jacket Chrome PVC Chrome PVC Red teflon Agency Approvals NEC Type CM NEC Type CM NEC Art 800 Type CMP Temperature Rating 80 C 80 C 200 C RTD Standards RTD Type al 2 3 4 5 6 7 8 1009 Platinum 0 00385 x x x 2000 Platinum 0 00385 x x x 5000 Platinum 0 00385 x x x 10000 Platinum 0 00385 x x x 1009 Platinum 0 03916 x x 2000 Platinum 0 03916 x x 5000 Platinum 0 03916 x x 10009 Platinum 0 03916 x x 100 Copper 0 00426 x 1209 Nickel 0 0 00618 X 1200 Nickel 0 00672 X 604Q Nickel Iron 0 00518 X a is the temperature coefficient of resistance which is defined as the resistance change per ohm per C International Electrotechnical Commission Standard 751 1983 German Standard DIN 43760 1980 and DIN 43760 1987 We recommend you use U S Standard D100 cO M O AUN Scientific Apparatus Makers Association Standard RC21 4 1966 Japanese Industrial Standard JIS C1604 1981 Japanese Standard JIS 1604 1989 Minco Type NA Nickel and Minco Type FA Nickel Iron Actual value at 0 C is 9 042Q per SAMA standard RC21 4 1966 0 Actual value at 0 C is 1000 per DIN standard ATTENTION RTDs that conform to the standards in the tab
7. 28 Hz input filter to provide 60 Hz line noise rejection scaling for 0 C to 60 C define upper and lower temperature limits Table 7 3 Channel Configuration Worksheet With Settings Established Bits 0 through 3 Input Type Select 0000 100 Pt 385 10110 5000 Pt 3916 1100 150Q Potentiometer 0001 2000 Pt 385 10111 10000 Pt 3916 1101 500 2 Potentiometer 0010 500 Pt 385 1000 100 Cu 427 1110 1000 Potentiometer 0011 1000 Pt 385 1001 1200 Ni 618 11112 3000 Potentiometer 0100 1000 Pt 3916 r _ 0101 2000 Pt 3916 1010 1200 Ni 617 1011 26040 Ni Fe 518 Bits 4 and 5 Data Format Select 00 engineering units x1 10 scaled for PID 0 to 16383 01 engineering units x1 Q 11 proportional counts 32768 to 32767 Bits 6 and 7 Broken Input Select 00 zero 01 upscale 10 downscale 11 Invalid Bit 8 Temperature Units 0 degrees Celsius 1 degrees Fahrenheit Select Bits 9and 10 Filter Frequency Select 00 10 Hz 01 50 Hz 10 60 Hz 11 250 Hz Bit 11 Channel Enable 0 channel disabled 1 channel enabled Bit 12 Excitation Current 0 1 0mA 1 0 25 mA Select Bit 13 Calibration Enable 0 enable 1 disabled Bits 14 and 15 Lead Res Enable 00 always 01 periodic 10 disable bi Actual value at 0 C is 9 042Q per SAMA standard RC21 4 1966 Actual value at 0 C is 1000 per DIN standard 3 Values are in 0
8. Publication 1746 UM003A EN P 4 20 Channel Configuration Data and Status Publication 1746 UM003A EN P e 8 e 9 Channel 0 Status Word Channel 1 Status Word 10 Channel 2 Status Word 11 Channel 3 Status Word 12 Channel 4 Status Word 13 Channel 5 Status Word 4 Channel 6 Status Word gt Channel 7 Status Word Figure 4 7 Module Input Image Status Word The channel status word can be analyzed bit by bit Each bits status 0 or 1 tells you how the input data from the RTD sensor or resistance device connected to a specific channel is translated for your application The bit status also informs you of any error condition and can tell you what type error occurred A bit by bit examination of the status word is provided in the following table Channel Configuration Data and Status 4 21 Table 4 25 Channel 0 through 7 Status Word l e 8 through l e 15 Bit Definitions Bit s Define These bit settings Indicate this 1 14 13 12 11 109 8 7 6 5 4 3 2 1 0 0 through 3 Input type 0 0 0 0 100Q Pt RTD 385 status 0 J0 10 1 200Q Pt RTD 385 0 0 1 0 500Q Pt RTD 385 0 0 1 t 10000 Pt RTD 385 0 1 0 0 100Q Pt RTD 3916 0 1 10 f1 2000 Pt
9. Set to Upscale Set to Downscale Invalid CO oO Temperature units selection Degrees cls Degrees Fb Filter frequency selection 28 Hz 50 60 Hz 800 Hz 6400 Hz O Ol Channel enable Channel Disabled Channel Enabled Excitation current selection 1 0 mA 0 25 mA Cal Disable Enable Disable Lead R Enable Disable Periodic Always Invalid 0 0 1 1 oO 1 Actual value at 0 C is 9 042Q per SAMA standard RC21 4 1966 2 Actual value at 0 C is 10002 per DIN standard 3 Values are in 0 1 degree step or 0 1Q step for all resistance input types except 15002 For the 150 resistance input type the values are in 0 01Q step 4 Values are in 1 degree step or 1Q2 step for all resistance input types except 15092 For the 150Q resistance input type the values are in 0 102 step Publication 1746 UM003A EN P 4 6 Channel Configuration Data and Status 5 This bit is ignored when a resistance device is selected Publication 1746 UMOO3A EN P Input Type Selection Bits 0 through 3 The input type bit field lets you configure the channel for the type of input device you have connected to the module Valid input devices are shown in the previous table Data Format Selection Bits 4 and 5 The data f
10. a change is made to its input type filter frequency or excitation current an operating channel is disabled and re enabled using its enable bit the periodic calibration bit is toggled from 1 disable to 0 enable and back to 1 disable Referring to the following ladder you can command your module to perform an autocalibration cycle by toggling the periodic calibration bit bit 15 To maintain system accuracy we recommend that you periodically perform an autocalibration cycle for example whenever an event occurs that greatly changes the internal temperature of the control cabinet such as opening or closing its door ata convenient time when the system is not making product such as during a shift change ATTENTION Ladder Programming Examples 5 11 Several channel cycles are required to perform an autocalibration and it is important to remember that during autocalibration the module is not converting input data Example Command the RTD module to perform an autocalibration of channel 0 The RTD module is in slot 3 This example assumes that the periodic calibration bit bit 15 is in the disabled state set to 1 Programming to Invoke Autocalibration Boo Channel 0 Flag ges B3 0 3 0 E L 1 15 Channel 0 Flag B3 Condition for 0 Autocalibration 1 I 1 B3 0 3 0 t OSR U Rung 2 1 p Channel 0 Flag B3 L__ I Publication 1746 UM003A EN P 5 12 Ladder Programm
11. ina ES Word Delimiter imi Slot Delimiter Chapter 4 gives you detailed bit information about the data content of the configuration word Input Image Data Words and Status Words The 8 word RTD module input image defined as the input from the RTD module to the CPU represents data words and status words Input words 0 through 7 data words hold the input data that represent the temperature value of the RTD input or ohmic value of the resistance inputs for channels 0 through 7 This data word is valid only when the channel is enabled and there are no channel errors When operating in Class 3 mode input words 8 through 15 status words contain the status of channels 0 through 7 respectively The status bits for a particular channel reflect the configuration settings that you have entered into the output image configuration word for that channel and provide information about the channels operational state To receive valid status information the channel must be enabled and the channel must have processed any configuration changes that may have been made to the configuration word Channel Filter Frequency Selection Preliminary Operating Considerations 3 5 Example To obtain the status of channel 2 input word 6 of the RTD module located in slot 3 in the SLC chassis use address 1 3 6 Slot File X Word 1 3 6 Element Delimiter 7 Word Delimiter Chapter 4 gives you detailed bit information about the content of the d
12. 0 011 F F 1 1 F 0 015 F F 5000 0 6 C 0 015 C C 0 4 C 0 012 C C 1 1 F 0 015 F F 0 7 F 0 012 F F 1000Q 0 9 C 0 026 C C 0 3 C 0 010 C C 1 6 F 0 026 F F 0 6 F 0 010 F F Copper 100 0 5 C 0 008 C C 0 8 C 0 008 C C 426 0 9 F 0 008 F F 1 4 F 0 008 F F Nickel 120Q 0 2 C 0 003 C C 0 2 C 0 005 C C 618 0 4 F 0 003 F F 0 4 F 0 005 F F Nickel 120Q 0 2 C 0 003 C C 0 2 C 0 005 C C 672 0 4 F 0 003 F F 0 4 F 0 005 F F Nickel Iron 604Q 0 3 C 0 008 C C 0 3 C 0 008 C C 518 0 5 F 0 008 F F 0 5 F 0 008 F F Resistance 150Q 0 20 0 004Q C 0 15Q 0 003Q C 0 0020 F 0 0020 F 5000 0 5Q 0 012Q C 0 5Q 0 012Q C 0 007Q F 0 007Q F 10000 1 0Q 0 025Q C 1 0Q 0 025Q C 0 014Q F 0 014Q F 30000 15Q 0 040Q C 1 20 0 040Q C 0 023Q F 0 023Q F Publication 1746 UM003A EN P Overview 1 5 Resistance Device Compatibility The table below lists the resistance input types you can use with the RTD module and gives each types associated specifications Table 1 3 Resistance Input Specifications Input Type Resistance Range Resistance Range Accuracy Temperature Resolution Repeatability 0 25 mA Excitation 1 0 mA Excit
13. 0 0458Q step Broken Input Selection Bits 6 and 7 The next table shows the descriptions for bits 6 and 7 The broken input bit field lets you define the state of the channel data word when an open circuit or short circuit condition is detected for that channel An open circuit condition occurs when the RTD or potentiometer or its extension wire is physically separated or opened This can happen if the wire is cut or disconnected from the terminal block The short circuit condition applies only to RTD input types This can happen if the RTD or its signal wires are shorted together for any reason The short circuit condition does not apply to resistance ranges since they start at 0 ohms which can be a short circuit condition Table 4 20 Bit Descriptions for Broken Input Selection Binary Select Description Value 00 Zero Force the channel data word to 0 during an open circuit condition or short circuit condition 01 Upscale Force the channel data word value to its full scale value during an open circuit or short circuit condition The full scale value is determined by the input type data format and scaling selected 10 Downscale Force the channel data word value to its low scale value during an open circuit or short circuit condition The low scale value is determined by the input type data format and scaling selected Channel Configuration Data and Status 4 17 Temperature Units Selection Bit
14. 850 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 1562 F 0 1 F 0 4 F 500Q 200 C to 850 C 200 C to 390 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 698 F 0 1 F 0 4 F 10000 200 C to 850 C 200 C to 50 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 122 F 0 1 F 0 4 F Platinum 391612 1000 200 C to 630 C 200 C to 630 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 1166 F 0 1 F 0 4 F 2000 200 C to 630 C 200 C to 630 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 1166 F 0 1 F 0 4 F 500Q 200 C to 630 C 200 C to 380 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 698 F 0 1 F 0 4 F 10002 200 C to 630 C 200 C to 50 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 122 F 0 1 F 0 4 F Copper 4262 9 100 100 C to 260 C 100 C to 260 C 0 1 C 0 2 C 328 F to 500 F 328 F to 500 F 0 1 F 0 4 F Nickel 618 2 1200 100 C to 260 C 100 C to 260 C 0 1 C 0 1 C 328 F to 500 F 328 F to 500 F 0 1 F 0 2 F Nickel 672 2 1200 80 C to 260 C 80 C to 260 C 0 1 C 0 1 C 328 F to 500 F 328 F to 500 F 0 1 F 0 2 F Nickel Iron 51812 6040 200 C to 200 C 200 C to 180 C 0 1 C 0 1 C 328 F to 392 F 328 F to 338 F 0 1 F 0 2 F 1 The temperature range for the 10000 500Q and 604Q RTD is dependent on the excitation current
15. B C D or non hazardous locations only The following WARNING statement applies to use in hazardous locations EXPLOSION HAZARD e Substitution of components may impair suitability for Class I Division 2 Do not replace components or disconnect equipment unless power has been switched off Do not connect or disconnect components unless power has been switched off All wiring must comply with N E C article 501 4 b Power Requirements Installation and Wiring 2 3 The RTD module receives its power through the SLC500 chassis backplane from the fixed or modular 5V dc 24V dc chassis power supply The maximum current drawn by the module is shown in the table below 5V de 24V de 0 100A 0 055A When you are using a modular system configuration add the values shown in the table above to the requirements of all other modules in the SLC chassis to prevent overloading the chassis power supply When you are using a fixed system controller refer to the Important note about module compatibility in a 2 slot expansion chassis on page 2 4 Publication 1746 UM003A EN P 2 4 Installation and Wiring Module Location in Chassis Modular Chassis Considerations Fixed Controller Compatibility Table
16. 0 A D _ Read Channel 1 A D Read Channel 0 A D Configure and Start Channel 1 A D Wait for Channel 1 A D Conversion Calculate Channel 0 Data Update Channel 0 Data Word Publication 1746 UM003A EN P 3 12 Turn On Time Preliminary Operating Considerations The table below gives you the turn on turn off and reconfiguration times for enabling or disabling a channel Description The time it takes to make converted data available in the data word and to set the status bit transition from 0 to 1 in the status word after setting the enable bit in the configuration word Duration Requires up to one module update time plus 510 msec 125 milliseconds x the number of unique input type and excitation current combinations Turn Off Time The time it takes to reset the status bit transition from 1 to 0 in the status word and to zero the data word after resetting the enable bit in the configuration word Requires up to one module update time Reconfiguration Time The time it takes to change a channel configuration ifthe new device type and excitation current are a unique combination The enable bit remains in a steady state of 1 Changing temperature resistance units or data format Requires up to one module update time plus 510 msec 4 125 milliseconds x the number of unique input type and excitation current combinations does not require reconfiguration time Publication 1746 UMO003A EN P By
17. 1 C step 0 1 F step 1 C step 1 F step 0 0507 C step 0 0912 F step 0 0127 C step 0 0228 F step 200 Platinum 3916 0 1 C step 0 1 F step 1 C step 1 F step 0 0507 C step 0 0912 F step 0 012 C step 0 0228 F step 109 Copper 426 0 1 C step 0 1 F step 1 C step 1 F step 0 0220 C step 0 0396 F step 0 0051 C step 0 0099 F step 1200 Nickel 6182 0 1 C step 0 1 F step 1 C step 1 F step 0 0220 C step 0 0396 F step 0 0051 C step 0 0099 F step 1209 Nickel 672 0 1 C step 0 1 F step 1 C step 1 F step 0 0208 C step 0 0374 F step 0 005 C step 0 0093 F step 1 When ohms are selected the temperature units selection bit 8 is ignored Analog input data is the same for either C or F sdection 2 Actual value at 0 C is 100Q per DIN standard Publication 1746 UMOO3A EN P Channel Configuration Data and Status 4 15 Table 4 13 Channel Data Word Resolution for 500Q Platinum 385 Excitation Current Data Format Bits 4 and 5 Engineering Units x 1 Engineering Units x Scaled for PID Proportional Counts 10 Default G F C oF C F C F 0 25 mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0641 C step 0 1154 F step 0 0160 C step 0 0288 F step 1 0 mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0360 C step 0 0648
18. 1 annel Z Data Wor Word2 l e 2 Input Image annel 3 Data Wor Word 3 l e 3 annel 4 Data Wor Word 4 l e 4 Channel 5 Data Word Word5 l e 5 Channel 6 Data Word Word6 l e 6 Channel 7 Data Word Word 7 l e 7 Channel 0 Status Word Word 8 l e 8 anne atus Wor Word 9 l e 9 Channel 2 Status Word Word 10 l e 10 Channel 3 Status Word Word 11 l e 11 Channel 4 Status Word Word 12 l e 12 Channel 5 Status Word Word 13 l e 13 Channel 6 Status Word Word 14 l e 14 Channel 7 Status Word Word 15 le 15 Bit 15 Bit 0 Publication 1746 UM003A EN P 3 4 Preliminary Operating Considerations Publication 1746 UMOO3A EN P Output Image Configuration Words The RTD module output image defined as the output from the CPU to the RTD module contains information that you configure to define the way a specific channel on the RTD module works The 1746 NR8 uses an 8 word output image when operating in a Class 1 mode and 24 word output image when operating in Class 3 mode These words take the place of configuration DIP switches on the module Output words 0 through 7 are used to define the operation of the module output words 8 through 23 are used for special user set scaling using the proportional counts data format Each output word 0 through 7 configures a single channel Example If you want to configure channel 2 on the RTD module located in slot 4 in the SLC chassis your address would be O 4 2 File Type 0 4 2 Word
19. 1 0 mA or 0 25 mA This bit field is active for all inputs A lower current reduces the error due to RTD self heating but provides a lower signal to noise ratio Refer to RTD vendor for recommendations See Appendix A for general information Table 4 24 Bit Description for Excitation Current Selection Binary Select Description Value 0 1 0 mA Set the excitation current to 1 0 mA 1 0 25 mA Set the excitation current to 0 25 mA Calibration Disable Bit 13 The module can disable or enable periodic calibration by setting the calibration disable bit for channel 0 Setting this bit to 0 enables the periodic calibration which occurs once every 5 minutes Setting this bit to 1 disables the periodic calibration Lead Resistance Measurement Enable Bits 14 and 15 The module can disable lead resistance measurement periodically measure the lead resistance or measure the lead resistance on each acquisition for each one of the 8 channels Setting a channels lead resistance enable bits to 00 disables the lead resistance measurement Setting a channel s lead resistance enable bits to 01 enables the periodic measurement of the lead resistance which occurs once every five minutes Setting a channel s lead resistance enable bits to 10 enables measurement of the lead resistance on each acquisition cycle Channel Data Word Channel Status Checking e 0 e 1 e 2 6 3 84 8 5 8 6 8 7 Channel
20. 2 The digits following the RTD type represent the temperature coefficient of resistance x which is defined as the resistance change per ohm per C For instance Platinum 385 refers to a platinum RT 3 Actual value at 0 C is 9 042Q per SAMA standard RC21 4 1966 4 Actual value at 0 C is 100Q per DIN standard D with 0 00385 ohms ohm C or simply 0 00385 C IMPORTANT The exact signal range valid for each input type is dependent upon the excitation current magnitude that you select when configuring the module For details on excitation current refer to Appendix A Publication 1746 UMOO3A EN P 1 4 Overview Table 1 2 RTD Accuracy and Temperature Drift Specifications Input Type 0 25 mA Excitation 1 0 mA Excitation Accuracy Temperature Drift Accuracy Temperature Drift Platinum 1000 0 5 C 0 012 C C 0 7 C 0 020 C C 385 0 9 F 0 012 F F 1 3 F 0 020 F F 200Q 0 6 C 0 015 C C 0 7 C 0 020 C C 1 1 F 0 015 F F 1 3 F 0 020 F F 5000 0 7 C 0 020 C C 0 5 C 0 012 C C 1 3 F 0 020 F F 0 9 F 0 012 F F 1000Q 1 2 C 0 035 C C 0 4 C 0 010 C C 2 2 F 0 035 F F 0 7 F 0 010 F F Platinum 10 Q 0 4 C 0 010 C C 0 6 C 0 015 C C 3916 0 7 F 0 010 F F 1 1 F 0 015 F F 200Q 0 5 C 0 011 C C 0 6 C 0 015 C C 0 9 F
21. 60 Hz filter frequency 209 6 Hz at 800 Hz filter frequency 1676 Hz at 6400 Hz filter frequency Calibration Module autocalibrates when e power is provided to the module e a channel is enabled e a change is made to its input type filter frequency or excitation current e the periodic calibration disable is set to 0 Isolation optical 500V ac for 1 minute between inputs and chassis ground and between inputs and backplane Isolation Between Inputs 5 V dc 1 Do not apply a voltage or current to the module LED Indicators 9 green status indicators one for each of 8 channels and one for module status Module ID Code 3508 Class 1 12708 Class 3 Maximum Termination Wire One 14 AWG wire per terminal Size Maximum Cable Impedance 25 ohms maximum impedance for 3 wire RTD configuration Terminal Block 1746 RT35 Publication 1746 UM003A EN P A 2 Specifications Environmental Specifications Operating Temperature 0 C to 60 C 32 F to 140 F Storage Temperature 40 C to 85 C 40 F to 185 F Relative Humidity 5 to 95 without condensation Hazardous Environment Classification Class I Division 2 Agency Certification UL and CSA Class when product or packaging is marked Division 2 Groups A B C D certified CE compliant for all applicable directives Input Specifications RTD Types platinum ni
22. 8 The following table shows the description for bit 8 The temperature units bit lets you select temperature engineering units in C or F for RTD input types This bit field is only active for RTD input types It is ignored when the resistance input type is selected Table 4 21 Bit Descriptions for Temperature Units Selection Binary Select If you want to Value 0 IC display the channel data word in C 1 F display the channel data word in F Filter Frequency Selection Bits 9 and 10 The following table shows the descriptions for bits 9 and 10 The channel filter frequency bit field lets you select one of four filters available for a channel The filter frequency affects the channel update time and noise rejection characteristics refer to Chapter 3 for details Table 4 22 Bit Descriptions for Filter Frequency Selection Binary Select Description Value 00 28 Hz Provide both 50 Hz and 60 Hz AC line noise filtering This setting increases the channel update time but also increases the noise rejection 01 50 60 Hz Provide both 50 Hz and 60 Hz AC line noise filtering 10 800 Hz Provide 800 Hz AC line noise filtering 11 6400 Hz Provide 6400 Hz AC noise filtering This setting decreases the noise rejection but also decreases the channel update time Channel Enable Selection Bit 11 The next table shows the description for bit 11 You use the channel enable bit to enable a channel The R
23. C 1 1 F 0 015 F F 1 3 F 0 020 F F 500 0 7 C 0 020 C C 0 5 C 0 012 C C 1 3 F 0 020 F F 0 9 F 0 012 F F 10002 1 2 C 0 035 C C 0 4 C 0 010 C C 2 2 F 0 035 F F 0 7 F 0 010 F F Platinum 10 0 0 4 C 0 010 C C 0 6 C 0 015 C C 3916 3 0 7 F 0 010 F F 1 1 F 0 015 F F 200Q 0 5 C 0 011 C C 0 6 C 0 015 C C 0 9 F 0 011 F F 1 1 F 0 015 F F 500Q 0 6 C 0 015 C C 0 4 C 0 012 C C 1 1 F 0 015 F F 0 7 F 0 012 F F 10002 0 9 C 0 026 C C 0 3 C 0 010 C C 1 6 F 0 026 F F 0 6 F 0 010 F F Copper 10Q 0 5 C 0 008 C C 0 8 C 0 008 C C 426 3 4 0 9 F 0 008 F F 1 4 F 0 008 F F Nickel 1200 0 2 C 0 003 C C 0 2 C 0 005 C C 618 35 0 4 F 0 003 F F 0 4 F 0 005 F F Nickel 1200 0 2 C 0 003 C C 0 2 C 0 005 C C 672 9 0 4 F 0 003 F F 0 4 F 0 005 F F Nickel Iron 604Q 0 3 C 0 008 C C 0 3 C 0 008 C C 518 8 0 5 F 0 008 F F 0 5 F 0 008 F F Resistance 2 1500 0 2Q 0 004Q C 0 15Q 0 003Q C 0 002Q F 0 0020 F 5000 0 5Q 0 012Q C 0 5Q 0 012Q C 0 007Q F 0 007Q F 10000 1 00 0 025Q C 1 0Q 0 025Q C 0 014Q F 0 014Q F 30000 1 5Q 0 040Q C 1 20 0 040Q C 0 023Q F 0 023Q F
24. Configuration 1746 0B16 1746 NR8 2009 Platinum RTD Bath LED Display DC Sinking Inputs BCD Format Channel Configuration Configure the RTD channel with the following setup e 2000 Platinum RTD e F in whole degrees zero data word in the event of an open or short circuit e 28 Hz input filter e 1 0 mA excitation current Publication 1746 UM003A EN P 1 2 Bit Definitions Application Examples Table 7 1 Channel Configuration Worksheet With Settings Established for Channel 0 Bits 0 through 3 Input Type Select 0000 100 Pt 385 0110 500Q Pt 3916 1100 150 Potentiometer 0001 2009 Pt 385 10111 10000 Pt 3916 1101 500Q Potentiometer 0010 500Q Pt 385 1000 100 Cu 426 1110 1000Q Potentiometer 0011 10000 Pt 385 1001 1200 Ni 618 2 1111 3000Q Potentiometer 0100 100 Pt 3916 0101 2000 Pt 3916 1010 12082 Ni 672 i 1011 604Q Ni Fe 518 Bits 4 and 5 Data Format Select 3 10 scaled for PID 0 to 16383 00 engineering units x1 01 engineering units x10 bom RE counts 32768 to Bits 6 and 7 Broken Input Select 00 zero 01 upscale 10 downscale 11 Invalid Bit 8 Temperature Units 0 degrees Celsius 1 degrees Fahrenheit Select Bits 9 and 10 Filter Frequency Select 00 28 Hz 01 50 60 Hz 10 800 Hz 11 6400 Hz Bit 11 Channel E
25. F 0 7 F 1 8 F 1200 Ni RTD 618 9 0 1 C 0 1 C 0 1 C 0 3 C 0 1 F 0 1 F 0 1 F 0 5 F 1200 Ni RTD 672 0 1 C 0 1 C 0 1 C 0 3 C 0 1 F 0 1 F 0 1 F 0 5 F 604Q NiFe RTD 518 0 1 C 0 1 C 0 1 C 0 3 C 0 1 F 0 1 F 0 1 F 0 5 F 150Q Resistance Input 0 01Q 0 01Q 0 02Q 0 08Q 5000 Resistance Input 0 10 0 10 0 1Q 0 4Q 10009 Resistance Input 0 1Q 0 10 0 20 0 6Q 30000 Resistance Input 0 1Q 0 1Q 0 30 1 062 1 The digits following the RTD type represent the temperature coefficient of resistance o which is defined as the resistance change per ohm per C For instance Platinum 385 refers to a platinum RTD with 0 00385 ohms ohm C or simply 0 00385 C 2 Actual value at 0 C is 9 042Q per SAMA standard RC21 4 1966 3 Actual value at 0 C is 100Q per DIN standard Preliminary Operating Considerations 3 7 Channel Cut Off Frequency The channel filter frequency selection determines a channels cut off frequency also called the 3 dB frequency The cut off frequency is defined as the point on the input channel frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation All frequency components at or below the cut off frequency are passed by the digital filter with less than 3 dB of attenuation All frequency components above the cut off frequency are increasingly at
26. F step 0 0090 C step 0 0162 F step 1 Table 4 14 Channel Data Word Resolution for 1000Q Platinum 385 Excitation Current Data Format Bits 4 and 5 Engineering Units x 1 Engineering Units x Scaled for PID Proportional Counts 10 Default C F C F C F C F 0 25 mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0641 C step 0 1154 F step 0 0160 C step 0 0288 F step 1 0mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0153 C step 0 0275 F step 0 0038 C step 0 0069 F step 1 Table 4 15 Channel Data Word Resolution for 500Q Platinum 3916 Excitation Current Data Format Bits 4 and 5 Engineering Units x 1 Engineering Units x Scaled for PID Proportional Counts 10 Default C F C F C F C F 0 25 mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0507 C step 0 0912 F step 0 0127 C step 0 0228 F step 1 0mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0354 C step 0 0637 F step 0 0089 C step 0 0159 F step 1 Table 4 16 Channel Data Word Resolution for 1000Q Platinum 3916 Excitation Current Data Format Bits 4 and 5 Engineering Units x 1 Engineering Units x Scaled for PID Proportional Counts 10 Default C F C F C F C F 0 25 mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0507 C step 0 0912 F step 0 0127 C step 0 0228 F step 1 0 mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0153 C step 0 0275 F step 0 0038 C step 0 0104 F ste
27. RTD 3916 0 1 0 500Q Pt RTD 3916 0 1 1 11 10000 Pt RTD 3916 1 10 0 0o 10 Cu RTD 426 0 0 1200 Ni RTD 618 0 1 0 1200 Ni RTD 672 0 1 1 6040 NiFe RTD 518 1 10 0 11500 Resistance Input 1 0 1 15000 Resistance Input 1 1 0 1000Q Resistance Input 1 1 1 3000Q Resistance Input 4 through 5 Data format 0 0 Engineering units x 113 status R x 0 Engineering units x 109 1 0 Scaled for PID 1 11 Proportional Counts 6 through 7 Broken input 0 0 Set to Zero status 0 Set to Upscale 1 0 Set to Downscale 1 I Not used 8 Temperature 0 Degrees C units status 1 Degrees p5 9 through 10 Filter frequency 0 J0 28 Hz status 0 50 60 Hz 1 0 800 Hz 1 M 6400 Hz 11 Channel enable 0 Channel Disabled status 1 Channel Enabled 12 Calibration Error 0 OK 1 Error 13 Broken input 0 OK 1 Error 14 Out of range 0 OK error status 1 Error 15 Configuration 0 OK Error 1 Error 1 Actual value at 0 C is 9 042Q per SAMA standard RC21 4 1966 2 Actual value at 0 C is 1000 per DIN standard 3 Values are in 0 1 degree step or 0 1Q step for all resistance input types except 1500 For the 150Q resistance input type the values are in 0 01Q step 4 Values are in 1 degree step or 1Q step for all resistance input types except 150Q For the 150 Q resistance input type the values are in 0 1Q step 5 This bit is cleared 0 when a resistance device such as a potentiometer is selected Publication 1746 UMOD3A EN P
28. RTD is beyond the user set scaling range Module Status LED Green The module status LED is used to indicate module related diagnostic or operating errors These non recoverable errors may be detected at power up or during module operation Once in a module error state the RTD module no longer communicates with the SLC processor Channels are disabled and data words are cleared 0 Failure of any diagnostic test places the module in a non recoverable state To exit this state cycle power If the power cycle does not work then call your local distributor or Rockwell Automation for assistance Publication 1746 UM003A EN P 6 6 Module Diagnostics and Troubleshooting Figure 6 2 Troubleshooting Flowchart Check LEDs on module I I Y Module Status Module Status Channel Status Channel Status Channel Status LED is off LED is on LED s is LED is off LED is on flashing Module fault Normal module y Channel is not Channel is condition operation Fault enabled enabled and condition working properly Check to see End Check channel Enable channel if that module is status word desired by setting seated properly bits 13 to 15 channel config in chassis word bit 11 1 Cycle power End
29. Sense 4 amp Return 1 RTD 2 e Return 4 Belden 9533 Shielded Cable or Q dnd 3 di 5 l ense Belden 83503 Shielded Cable Retur returns RID6 Cable Shield F Q able Shield Frame Ground S RTD 0 Q Return 6 Sense 0 Q RTD 7 e Return 0 Sense 7 O RTD 1 Return 7 UG Sense 1 Return 1 Sms O Sense2 Return Leave One Sensor Wire Open Belden 9533 Shielded Cable or Belden 83503 Shielded Cable Publication 1746 UMO03A EN P When using a 3 wire configuration the module compensates for resistance error due to lead wire length For example in a 3 wire configuration the module reads the resistance due to the length of one of the wires and assumes that the resistance of the other wire is equal If the resistances of the individual lead wires are much different an error may exist The closer the resistance values are to each other the greater the amount of error that is eliminated Installation and Wiring 2 11 To ensure temperature of resistance value accura the IMPORTANT P e resistance difference of the cable lead wires must be equal to or less than 0 012 There are several ways to insure that the lead values match as closely as possible They are as follows e Keep lead resistance as small as possible and less than 25 Use quality cable that has a small tolerance impedance rating Use a heavy gauge lead wire which has less resistance per foot Wiring Resistance Devices Pot
30. Units x 1 Engineering Units x 10 Scaled for PID Proportional Counts 01C 0 1 F 1 0 C 1 0 F Default 0 25 mA 2000 t0 6300 3280t0 11660 200104630 1 328t0 1166 0 to 16383 32768 to 32767 1 0mA 2000 to 500 3280 to 1220 200t0 50 328t0 122 0 to 16383 32768 to 32767 Excitation Current Data Format Table 4 8 Data Format for 604 2 Nickel Iron RTD 518 Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional Counts 0 1 C 0 1 F 1 0 C 1 0 F Default 0 25 mA 2000 to 2000 l 3280 to 3920 200t0 200 328t0 392 10 to 16383 32768 to 32767 1 0 mA 2000 to 1800 l 3280 to 3380 200t0 180 328t0 338 10 to 16383 32768 to 32767 Publication 1746 UM003A EN P 4 14 Resistance Input Type 1500 Channel Configuration Data and Status The following tables show the resistance ranges provided by the 1746 NR8 Table 4 9 Data Format for 150Q Resistance Input Data Format Engineering Units x 1 Engineering Units x 10 Scaled for PID 0 010 0 to 15000 0 10 Oto 1500 Proportional Counts Default 0 to 16383 32768 to 32767 1 When ohms are selected the temperature units selection bit 8 is ignored Resistance Input Type Table 4 10 Data Format for 5000 and 1000 2 Resistance Input Data Format Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional Count
31. cables as short as possible Locate your I O chassis as near the RTD sensors as your application permits Ground the shield drain wire at one end only The preferred location is at the chassis mounting tab of the rack under the RTD module Refer to IEEE Std 518 Section 6 4 2 7 or contact your sensor manufacturer for additional details Route RTD resistance input wiring away from any high voltage I O wiring power lines and load lines e Tighten terminal screws using a flat head screwdriver Each screw should be turned tight enough to immobilize the wire s end Excessive tightening can strip the terminal screw The torque applied to each screw should not exceed 0 25 Nm 2 25 in Ibs for each terminal e Follow system grounding and wiring guidelines found in your SLC 500 Installation and Operation Manual publication 1747 6 2 Publication 1746 UM003A EN P 2 10 Installation and Wiring 2 Wire Interconnection Return 3 Wire Interconnection Return 4 Wire Interconnection Sense Return Figure 2 2 RTD Connections to Terminal Block Add Cable Shield Frame RTD 0 Ground ENDE Sense 0 SN Return 0 SS RTD 0 RTD 1 Se oO Sense 0 Return Q Return 0 RTD2 1 Sense 2 Q Sense 1 Belden 9501 Shielded Cable Return2 Q Return 1 Q RTD 2 Sense 2 Return Cable Shield Frame RTDO S RID 3 Ground S Senesi Sense 3 0 Return 3 RTD 4 9 Sense 1 S
32. configuration word 4 17 bit description in status word 4 22 terms G 1 torque 2 9 terminal block screws 2 9 troubleshooting 6 7 contacting Allen Bradley P 3 flowchart 6 7 LED examination 6 2 turn on time 3 12 U under range error 4 23 fault bit 4 23 update time G 3 channel update time 3 70 module update time 3 70 V Verification of dynamic configuration change 5 4 W wiring 2 7 routing of wires 2 9 Publication 1746 UMOO3A EN P iv Index Publication 1746 UMOO3A EN P Reach us now at www rockwellautomation com Wherever you need us Rockwell Automation brings together leading brands in industrial automation including Allen Bradley controls Reliance Electric power transmission products Dodge mechanical power transmission components and Rockwell Software Rockwell Automation s unique flexible approach to helping customers achieve a competitive advantage is supported by thousands of authorized partners distributors and system integrators around the world e Allen Bradley FEWER poer lo Americas Headquarters 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 European Headquarters SA NV avenue Herrmann Debroux 46 1160 Brussels Belgium Tel 32 2 663 06 00 Fax 32 2 663 06 40 Asia Pacific Headquarters 27 F Citicorp Centre 18 Whitfield Road Causeway Bay Hong Kong Tel 852 2887 4788 Fax 852 2508 1846 Automation Publication 1746 UM003A EN P J
33. of bits For example a 12 bit system has 4 096 possible output states It can therefore measure 1 part in 4096 RTD Resistance Temperature Detector temperature sensing element with 2 3 or 4 lead wires It uses the basic characteristic that electrical resistance of metals increases with temperature When a small current is applied to the RTD it creates a voltage that varies with temperature This voltage is processed and converted by the RTD module into a temperature value sampling time The time required by the A D converter to sample an input channel status word Contains status information about the channels current configuration and operational state You can use this information in your ladder program to determine whether the channel data word is valid step response time This is the time required for the A D input signal to reach 100 of its expected final value given a large step change in the input signal update time The time required for the module to sample and convert the input signals of all enabled input channels and make the resulting data values available to the SLC processor Publication 1746 UM003A EN P Glossary 4 Publication 1746 UM003A EN P A A D 6 1 abbreviations G 1 addressing configuration word 3 4 addressing example 3 4 data word addressing example 3 5 status word 3 4 addressing example 3 5 Allen Bradley P 3 contacting for assistance P 3 application examples 7 7 attenuation G 1
34. the minimum allowed default or user set temperature When this occurs the channel data word is set to its minimum value TITTEN There is no under range error for a direct resistance input default scaling This bit is cleared 0 for the following conditions e Channel is disabled e Channel operation is normal the out of range condition clears e Broken input error bit bit 13 is set 1 Configuration Error Bit 15 This bit is set 1 whenever an enabled and configured channel detects that the channel configuration word is not valid A configuration word is not valid for any of the following reasons e Input type is a 100 Copper RTD and the excitation current is set for 0 25 mA which is not allowed e Lead R Enable bits 14 and 15 are set to 11 which is invalid e Broken Input select bits 6 and 7 are set to 11 which is invalid e Data format bits are set to 11 and the lower limit user set scale is equal to the upper limit user set scale and not equal to 0 All other status bits reflect the settings from the configuration word even those settings that may be in error However bit 15 is cleared if the channel is disabled or if channel operation is normal Chapter 5 Ladder Programming Examples Earlier chapters explained how the configuration word defines the way a channel operates This chapter shows the programming required to enter the configuration word into the processor memory It also provides you with seg
35. 0 Upper Scale Limit 0 e 10 Channel 1 Lower Scale Limit O e 11 Channel 1 Upper Scale Limit 0 e 12 Channel 2 Lower Scale Limit 0 e 13 Channel 2 Upper Scale Limit 0 e 14 Channel 3 Lower Scale Limit 0 e 15 Channel 3 Upper Scale Limit 0 e 16 Channel 4 Lower Scale Limit 0 e 17 Channel 4 Upper Scale Limit 0 e 18 Channel 5 Lower Scale Limit 0 e 19 Channel 5 Upper Scale Limit 0 e 20 Channel 6 Lower Scale Limit 0 e 21 Channel 6 Upper Scale Limit 0 e 22 Channel 7 Lower Scale Limit 0 e 23 Channel 7 Upper Scale Limit Publication 1746 UM003A EN P Channel Configuration Procedure Channel Configuration Data and Status 4 3 Module default settings for configuration words 0 through 7 are all zeros Scaling defaults are explained on page 4 9 under the explanation for the User set Scaling Select bits 13 and 14 The channel configuration word consists of bit fields the settings of which determine how the channel operates This procedure looks at each bit field separately and helps you configure a channel for operation Refer to the table on page 4 5 and the bit field descriptions that follow for complete configuration information See page B 1 for a configuration worksheet that can assist your channel configuration Configure Each Channel 1 Determine the input device type RTD type or resistance input for a channel and enter its respective 4 digit binary code in bit field 0 3 Input Type Selection of the ch
36. 00 Hz 209 8 Hz 3 75 msec 6400 Hz 1677 Hz 1 47 msec Publication 1746 UM003A EN P 3 6 Preliminary Operating Considerations Publication 1746 UMOO3A EN P Effective Resolution The effective resolution for an input channel depends upon the filter frequency selected for that channel The following table displays the effective resolution for the various input types and filter frequencies Table 3 2 Effective Resolution for RTD and Resistance Inputs Input Type Filter Frequency 28 Hz 50 60 Hz 800 Hz 6400 Hz 1000 Pt RTD 385 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 2000 Pt RTD 385 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 5000 Pt RTD 385 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 10009 Pt RTD 385 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 1000 Pt RTD 3916 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 2000 Pt RTD 3916 1 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 5000 Pt RTD 3916 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 10000 Pt RTD 391 6 0 1 C 0 1 C 0 2 C 0 8 C 0 1 F 0 1 F 0 4 F 1 4 F 100 Cu RTD 426 1 2 0 1 C 0 1 C 0 4 C 1 0 C 0 1 F 0 2
37. 1 step or 0 1Q step for all resi stance input types except 1500 For the 150Q resistance input type the values are in 0 01Q step 4 Values are in 1 step or 1Q step for all resistance input types except 150 For the 150Q resistance input type the values are in 0 1 Q step Publication 1746 UM003A EN P 7 6 Application Examples Publication 1746 UMOO3A EN P Program Setup and Operation Summary 1 The alarms section of the ladder program monitors for any out of range condition Set up two configuration words in memory for each channel one for C and the other for F The following table shows the configuration word allocation summary Table 7 4 Configuration Word Allocation Channel Configuration Word Allocation F C 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 N1 0 8 0 9 0 1 z Z Z Z Z Z Z z Z Z Z zZ Z Z Z N DVI cn ala ala If e cy Mm 0 0 0 1 0 0 When the position of the degrees selector switch changes write the appropriate channel configuration to the RTD module Note that the use of the OSR instruction one shot rising makes these configuration changes edge triggered that is the RTD is reconfigured only when the selector switch changes position Convert the individual RTD data words to BCD and send the data to the respective LED displays Program Listing The first two rungs of this program send th
38. 1 5 Communication Flow Channel Data Words r sl annel Status Words RTD Resistance ___ 1746 NR8 e di SLC 500 Analog Signals Input Processor Module Scaling Limit Words Channel Configuration Words Chassis Backplane The Channel Configuration Words output image contain user defined configuration information for the specified input channel This information is used by the module to configure and operate each channel The Channel Status Words input image contain status information about the channel s current configuration and operational state The input data values of the analog input channel are contained in the Channel Data Word input image which is valid only when the channel is enabled and there are no channel errors for example broken sensor or overrange The user set Scaling Limit Words output image provide a user definable scaling range for the temperature resistance data when using the proportional counts data type Compliance to Europe Union Directives Chapter 2 Installation and Wiring This chapter tells you how to e comply to European union directives avoid electrostatic damage e determine the RTD modules chassis power requirement e choose a location for the RTD module in the SLC chassis e install the RTD module e wire the RID modules terminal block This product is approved for installation within the European Union and EEA regi
39. 12 13 14 15 Address N10 0 N10 1 N10 2 N10 3 N10 4 N10 5 N10 6 N10 7 N10 8 N10 9 N10 1 0 2 5 N10 1 N10 1 N10 13 N10 14 N10 1 Publication 1746 UMOO3A EN P Electrical Specifications Physical Specifications Specifications Appendix A This appendix lists the specifications for the 1746 NR8 RTD Input Module Backplane Current Consumption 100 mA at 5V de 55 mA at 24V de Backplane Power Consumption 1 82W maximum 0 5W at 5V dc 1 32W at 24V dc External Power Supply Requirements None Number of Channels 8 backplane isolated 1 0 Chassis Location Any 1 0 module slot except slot 0 A D Conversion Method Sigma Delta Modulation Input Filtering Low pass digital filter with programmable notch filter frequencies Common Mode Rejection between inputs and chassis ground gt 120 dB at 50 Hz 28 Hz and 50 Hz filter frequencies gt 120 dB at 60 Hz 28 Hz and 60 Hz filter frequencies Normal Mode Rejection between input and input 65 dB minimum at 50 60 Hz with 50 60 Hz filter 110 dB minimum at 50 Hz with 28 Hz filter 95 dB minimum at 60 Hz with 28 Hz filter Max common mode voltage 1 volt Max allowed permanent overload Volts 5V dc Current 5 mA Input Filter Cut Off Frequencies 7 80 Hz at 28 Hz filter frequency 13 65 Hz at 50
40. 4 22 Channel Configuration Data and Status Publication 1746 UMOO3A EN P Explanations of the status conditions follow TNT AN Ihe status bits reflect the settings that were made in the configuration word However two conditions must be true if the status reflected is to be accurate e The channel must be enabled e The channel must have processed any new configuration data Input Type Status Bits 0 through 3 The input type bit field indicates what type of input device you have configured for the channel This field reflects the input type selected in bits 0 through 3 of the channel configuration word when the channel is enabled If the channel is disabled these bits are cleared 0 Data Format Status Bits 4 and 5 The data format bit field indicates the data format you have defined for the channel This field reflects the data type selected in bits 4 and 5 of the channel configuration word when the channel is enabled If the channel is disabled these bits are cleared 0 Broken Input Status Bits 6 and 7 The broken input bit field indicates how you have defined the channel data to respond to an open circuit or short circuit condition This field reflects the broken input type selected in bits 6 and 7 of the channel configuration word when the channel is enabled If the channel is disabled these bits are cleared 0 Temperature Units Status Bit 8 The temperature units field indicates the state of the tempera
41. 68 to 32767 1 Actual value at 0 C is Excitation Current 0002 per DIN standard Data Format Table 4 4 Data Format for 500 2 Platinum RTD 385 Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional Counts 01C 0 1 F 1 0 C 1 0 F Default 0 25 mA 2000 to 8500 3280 to 15620 200 to 850 328 to 1562 0 to 16383 32768 to 32767 1 0 mA 2000 to 3900 3280 to 6980 200 to 390 328t0 698 0 to 16383 32768 to 32767 Excitation Current Data Format Table 4 5 Data Format for 1000 2 Platinum RTD 385 Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional Counts 0 1 C 0 1 F 1 0 C 1 0 F Default 0 25 mA 2000 to 8500 3280 to 15620 200 to 850 328t0 1562 0 to 16383 32768 to 32767 1 0mA 2000 to 500 3280 to 1220 200 to 50 328t0 122 0 to 16383 32768 to 32767 Excitation Current Data Format Table 4 6 Data Format for 500 2 Platinum RTD 3916 Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional Counts 0 1 C 0 1 F 1 0 C 1 0 F Default 0 25 mA 2000 to 6300 3280t0 11660 200 to 630 3281041166 0 to 16383 32768 to 32767 1 0mA 2000 to 3800 32801046980 200t0 380 328t0 698 0to 16383 32768 to 32767 Excitation Current Data Format Table 4 7 Data Format for 1000 2 Platinum RTD 3916 Engineering
42. Allen Bradley SLC 5007 RTD Resistance Input Module Catalog Number 1746 NR8 User Manual I ia LI if LE e I i L i Automation E t Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for purposes of example Since there are many variables and requirements associated with any particular installation Allen Bradley does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Allen Bradley publication SGI 1 1 Safety Guidelines for the Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or part without written permission of Rockwell Automation
43. Configuration Data and Status 4 19 The actual RTD or resistance input sensor values reside in I e 0 through I e 7 of the RTD module input image file The data values present depend on the input type and data format you have selected in your configuration for the channel When an input channel is disabled its data word is reset 0 Two conditions must be true for the value of the data word to be valid The channel must be enabled channel status bit 1 There must be no channel errors or channel LED on channel error bit 0 Figure 4 6 Module Input Image Data Words Channel 0 Data Word Channel 1 Data Word Channel 2 Data Word Channel 3 Data Word Channel 4 Data Word Channe 5 Data Word Channel 6 Data Word Channe 7 Data Word The channel status word is a part of the RTD modules input image Input words 8 through 15 Class 3 only correspond to and contain the configuration status of channels 0 through 7 respectively You can use the data provided in the status word to determine if the data word for any channel is valid per your configuration in O e 0 through O e 7 or O e 23 Class 3 only For example whenever a channel is disabled O e x 11 0 its corresponding status word shows all zeros This condition tells you that input data contained in the data word for that channel is not valid and should be ignored
44. Configuration Words 3 4 Input Image Data Words and Status Words 3 4 Channel Filter Frequency Selection 2 22 22 04 3 5 1746 NR8 Channel Step Response 3 5 Effective Resolution 4v EA Me ee Nk as 3 6 Channel Cut Off Frequency 2 2022 zes 3 7 Channel Autocalibration edo OR ea 3 10 Update Time and Scanning Process 3 10 Input Response ee eed de e eased 3 12 Output Response 2254 uses ne ir 3 12 Chapter 4 Channel Conhguration szu2u822 ae eee 4 1 Channel Configuration Procedure 4 3 Configure Each Channielyas 23 2 222m w ug 4 3 Enter the Configuration Date na aan date 4 4 Input Type Selection Bits 0 through 3 4 6 Data Format Selection Bits 4 and 5 4 6 Broken Input Selection Bits 6 and 7 2 22 22 22 202 242 4 16 Temperature Units Selection Bit 8 4 17 Filter Frequency Selection Bits 9 and 10 4 17 Channel Enable Selection Bit 11 4 17 Excitation Current Selection Bit 12 4 18 Calibration Disable Bit 13 colui nt 4 18 Lead Resistance Measurement Enable Bits 14 and 15 4 18 Channel Data Word ES sl dla na 4 19 Channel Status Checking ne Sue ne dent 4 19 Input Type Status Bits 0 through 3 4 22 Data Format Status Bits 4 and 5 4 22 Broken Inp
45. TD connection which provides excitation current a sense connection which detects lead wire resistance a return connection which reads the RTD or resistance value Each of these analog inputs are multiplexed to an analog converter The A D converter cycles between reading the RTD or resistance value the lead wire resistance and the excitation current From these readings an accurate temperature or resistance is returned to the user program The RTD module is isolated from the chassis backplane and chassis ground The isolation is limited to 500V ac Optocouplers are used to communicate across the isolation barrier Channel to channel common mode isolation is limited to 5 volts LED Status The illustration below shows the RID module LED panel consisting of nine LEDs The state of the LEDs for example off on or flashing depends on the operational state of the module see table on page 1 9 Overview 1 9 Figure 1 4 LED Indicators D SONA WS S WS u zn INPUT CHANNEL STATUS MODULE _ RTD resistance RTD Module The purpose of the LEDs is as follows e Channel Status One LED for each of the 8 input channels indicates if the channel is enabled disabled or is not operating as configured due to an error e Module Status If OFF or flashing at any time other than at powerup this LED indicates that non recoverable module errors for example diagnostic or operating errors hav
46. TD module only scans those channels that are enabled To optimize module operation and minimize throughput times you should disable unused channels by setting the channel enable bit to zero When set 1 the channel enable bit is used by the module to read the configuration word information you have selected While the enable bit is set modification of the configuration word may lengthen the module update time for one cycle If any change is made to the configuration word the change must be reflected in the status word before new data is valid Refer to Channel Status Checking on page 4 19 Publication 1746 UM003A EN P 4 18 Channel Configuration Data and Status Publication 1746 UMOO3A EN P While the channel enable bit is cleared 0 the channel data word and status word values are cleared After the channel enable bit is set the channel data word and status word remain cleared until the RTD module sets the channel status bit bit 11 in the channel status word Table 4 23 Bit Descriptions for Channel Enable Selection Binary Value Select If you want to 0 channel disable disable a channel Disabling a channel causes the channel data word and the channel status word to be cleared 1 channel enable enable a channel Excitation Current Selection Bit 12 The following table shows the description for bit 12 Use this bit to select the magnitude of the excitation current for each enabled channel Choose from cither
47. al mode rejection G 3 0 open circuit 6 4 error condition 6 4 out of range error 6 5 over range error fault bit 4 24 under range error 4 23 fault bit 4 23 output image 3 4 output response to slot disabling 3 12 over range error 4 24 P PID input type 4 6 PID instruction application example 5 5 programming 5 5 pot definition G 3 potentiometer 2 wire pot interconnection 2 72 3 wire pot interconnection 2 12 ohmic values 1 5 repeatability 7 5 wiring diagram 2 12 wiring inputs 2 11 2 14 power up sequence 7 8 programming application examples 7 7 configuration settings 5 2 initial setting 5 2 making changes 5 4 proportional counts data format 5 7 proportional counts data format application example 5 7 proportional counts input 4 6 publications related P 2 remote configuration G 3 removable terminal block 7 6 removing the module 2 7 removing the terminal block 2 6 resistance device types ohmic values 1 5 potentiometers 7 5 resolution 3 6 G 3 routing of wires 2 9 RTD definition G 3 excitation current definition and values G 2 RTD Temperature Ranges Resolution and Repeatability A 3 S sampling time G 3 scaled for PID 4 6 scaling 4 10 scaling input data G 2 scanning process scanning cycle 3 10 update time 3 70 self locking tabs 7 6 specifications A 7 cable A 5 standards for RTDs A 5 status word G 3 Index iii step response 3 5 G 3 system operation 1 7 T temperature units 4 17 bit description in
48. ale 10 downscale 11 Invalid Bit 8 Temperature Units 0 degrees Celsius 1 degrees Fahrenheit Select Bits9and 10 Filter Frequency Select 00 28 Hz 01 50 60 Hz 10 800 Hz 1126400 Hz Bit 11 Channel Enable 0 channel disabled 1 channel enabled Bit 12 Excitation Current 021 0 mA 120 25 mA Select Bit 13 Cal Disable 0 enable calibration 1 disable calibration default Bits 14 and 15 Lead R Enable 00 Disable 01 Periodic 10 Always 11 Invalid 1 Actual value at C is 9 042Q per SAMA standard RC21 4 1966 2 Actual value at 0 C is 1000 per DIN standard 3 Values are in 0 1 step or 0 1 Q step for all resi stance input types except 1500 For the 150Q resistance input type the values are in 0 01Q step 4 Values are in 1 step or 1Q step for all resistance input types except 150Q For the 150Q resistance input type the values are in 0 1 step Publication 1746 UM003A EN P B 2 Configuration Worksheet for RTD Resistance Module Publication 1746 UM003A EN P Glossary The following terms and abbreviations are specific to this product For a complete listing of Allen Bradley terminology refer to the Allen Bradley Industrial Automation Glossary Publication Number AG 7 1 A D Refers to the analog to digital converter inherent to the RTD Resistance input module The converter produces a digital value whose magnitude is proportional to the instantaneous magnitude of an analo
49. and basic functions via hardware and software diagnostics During this time the module status LED remains off and the channel status LEDs are turned on If no faults are found during the power up diagnostics the module status LED is turned on and the channel status LEDs are turned off After power up checks are complete the RTD module waits for valid channel configuration data from your SLC ladder logic program channel status LEDs off After configuration data is written to one or more channel configuration words and their channel enable bits are set by the user program the channel status LEDs go on and the module continuously converts the RTD or resistance input to a value within the range you selected for the enabled channels The module is now operating in its normal state Each time a channel is read by the module that data value is tested by the module for a fault condition for example open circuit short circuit over range and under range If such a condition is detected a unique bit is set in the channel status word and the channel status LED flashes indicating a channel error condition The SLC processor reads the converted RTD or resistance data from the module at the end of the program scan or when commanded by the ladder program The processor and RTD module determine that the backplane data transfer was made without error and the data is used in your ladder program Module Operation Each input channel consists of an R
50. annel configuration word 2 Select a data format for the data word value Your selection determines how the analog input value from the A D converter is expressed in the data word Enter your 2 digit binary code in bit field 4 and 5 Data Format Selection of the channel configuration word If you have chosen proportional counts data format you may define the scaling range The default valves for the limit registers are 0 If the lower limit and the upper limit are both 0 the module uses 32 768 as the lower limit and 32 767 as the upper limit If the lower limit is equal to the upper limit a configuration error occurs Otherwise the module uses limit values in these registers Make sure to enter the lower and upper limits in the scale limit registers for that channel if you want user defined scaling An example on page 4 9 user set scaling explains how to do this 3 Determine the desired state for the channel data word if a broken input condition is detected for that channel open circuit or short circuit Enter the 2 digit binary code in bit field 6 and 7 Broken Input Selection of the channel configuration word 4 If the channel is configured for RTD inputs and engineering units data format determine if you want the channel data word to read in degrees Fahrenheit or degrees Celsius and enter a one or a zero in bit 8 Temperature Units of the configuration word If the channel is configured for a resistance input this field is ign
51. ant radiated heat such as the 32 point I O modules Module Installation and When installing the module in a chassis it is not necessary to remove the Removal terminal block from the module However if the terminal block is removed use the write on label located on the side of the terminal block as shown below to identify the module location and type SLOT RACK e MODULE Publication 1746 UM003A EN P 2 6 Installation and Wiring Removing the Terminal Block Mathie Never install remove or wire modules with power applied to the chassis or devices wired to the module To avoid cracking the removable terminal block alternate the removal of the slotted terminal block release screws 1 Loosen the two terminal block release screws p Terminal Block Release Screw Requires a 0 100 in slot screwdriver OOOO00000000000000000000 Maximum Torque 0 25 Nm 2 25 in Ibs 2 Grasp the terminal block at the top and bottom and pull outward and down Publication 1746 UMOO3A EN P Installation and Wiring 2 7 Installing the Module 1 Align the circuit board of the RTD module with the card guides located at the top and bottom of the chassis as shown in the following illustration od ao N N WwW Y gt M Top and Bottom Module Releases 2 Slide the module into the chassis until both top and bottom retaining clips are secured Apply firm even pressur
52. ata word and the status word The RTD module uses a digital filter that provides noise rejection for the input signals The digital filter is programmable allowing you to select from four filter frequencies for each channel Selecting a low value for example 28 Hz for the channel filter frequency provides greater noise rejection for a channel but also increases the channel update time Selecting a high value for the channel filter frequency provides lesser noise rejection but decreases the channel update time The Notch Frequencies table in the next section shows the available filter frequencies as well as the associated minimum normal mode rejection NMR cut off frequency and step response for each filter frequency The graphs on page 3 8 and page 3 9 show the input channel frequency response for each filter frequency selection 1746 NR8 Channel Step Response The channel filter frequency determines the channel s step response The step response is the time required for the analog input signal to reach 10096 of its expected final value This means that if an input signal changes faster than the channel step response a portion of that signal is attenuated by the channel filter The table below shows the step response for each filter frequency Table 3 1 Notch Frequencies Filter Frequency 50Hz NMR 60HzNMR 3dB Cut Off Step Response Frequency 28H M10d 95dB 780H 120mse 50 60 Hz 65 dB 65 dB 13 65 Hz 68 6 msec 8
53. ation Drift Resistance 1500 0Q to 150Q 0Q to 150Q 2 0 004Q C 0 01Q 0 04Q 0 0020 F 9 500Q 0Q to 500Q 0Q to 500Q 0 5Q 0 012Q C 0 1Q 0 20 0 0070 F 10000 00 to 10000 OQ to 10002 1 0Q 0 025Q C 0 1Q 0 20 0 0140 F 30000 0N to 30000 OQ to 12000 150 00400 C 1010 0 20 0 023Q F 1 The accuracy values assume that the module was calibrated within the specified temperature range of 0 C to 60 C 32 F to 140 F 2 The accuracy for 1502 is dependent on the excitation current 0 2 Q at 0 25 mA and 0 15Q at 1 0 mA 3 The temperature drift for 1502 is dependent on the excitation current 0 006 2 C at 0 25 mA and 0 004Q at 1 0 mA Hardware Overview The RTD module occupies one slot in an SLC 500 e modular system except the processor slot 0 e fixed system expansion chassis 1746 A2 The module uses eight input words and eight output words for Class 1 and 16 input words and 24 output words for Class 3 If the RTD module resides in a remote configuration with a SLC 500 Remote I O Adapter Module 1747 ASB use block transfer for configuration and data retrieval Block transfer requires a 1747 SN Remote I O Scanner Series B IMPORTANT or PLC processor As shown in the illustration below and table that follows the module contains a removable terminal block item 3 providing connection for any mix of eight RTD sensors or resistance input devices There are no output channels on the module Module con
54. calibration disable bit to 0 To disable autocalibration all channel calibration disable bits must be set to 1 You can control the module autocalibration time by disabling autocalibration and then setting any channels calibration disable bit to 0 waiting at least one module scan time and then resetting that channel calibration disable bit to 1 Several scan cycles are required to perform an autocalibration see page 3 10 It is important to remember that during autocalibration the module is not converting input data Publication 1746 UM003A EN P 2 16 Installation and Wiring Publication 1746 UMO03A EN P TIP To maintain system accuracy we recommend that you periodically perform an autocalibration cycle for example gt e whenever an event occurs that greatly changes the internal temperature of the control cabinet such as opening or closing its door ata convenient time when the system is not making product such as during a shift change An autocalibration programming example is provided on page 5 10 Single Point Calibration Single point calibration is an optional procedure that can be used to improve the accuracy of the RTD module and cable combination to greater than 0 2 C when the RTD is operating at 50 C of the calibration temperature The offset determined by the single point calibration can be used to compensate for inaccuracies in the RTD module and cable combination After single point calibration is per
55. cifications A 3 Module Accuracy RTD Temperature Ranges Resolution and Repeatability Input Type Temp Range Temp Range Resolution Repeatability 0 25 mA Excitation 1 0 mA Excitation 28 Hz 50 60 Hz Platinum 385 1000 200 C to 850 C 200 C to 850 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 1562 F 0 1 F 0 4 F 2000 200 C to 850 C 200 C to 850 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 1562 F 0 1 F 0 4 F 5000 200 C to 850 C 200 C to 390 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 698 F 0 1 F 0 4 F 10000 200 C to 850 C 200 C to 50 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 122 F 0 1 F 0 4 F Platinum 3916 Q 200 C to 630 C 200 C to 630 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 1166 F 0 1 F 0 4 F 2000 200 C to 630 C 200 C to 630 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 1166 F 0 1 F 0 4 F 5000 200 C to 630 C 200 C to 380 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 698 F 0 1 F 0 4 F 10000 200 C to 630 C 200 C to 50 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 122 F 0 1 F 0 4 F Copper 426 7 100 100 C to 260 C 100 C to 260 C 0 1 C 0 2 C 328 F to 500 F 328 F to 500 F 0 1 F 0 4 F Nickel 618 100 1200 100 C to 260 C 100 C to 260 C 0 1 C 0 1 C 328 F t
56. ckel nickel iron copper For additional information on RTD types see page A 3 Temperature Scale Cor Fand0 1 Cor0 1 F Selectable Resistance Scale 1Q or 0 1Q for all resistance ranges except 150 or 0 1Q or Selectable 0 01Q for 150 potentiometer Input Step Response See channel step response page 3 5 Input Resolution and Repeatability See RTD and resistance device compatibility tables on page 1 3 Display Resolution See Channel Data Word Resolution table on page 4 14 Module Update Time See Chapter 3 Update Time page 3 10 Channel Turn On Time Requires up to one module update time plus 125 milliseconds x the number of unique input type and excitation current combinations Channel Turn Off Time Requires up to one module update time Reconfiguration Time Requires up to one module update time plus 125 milliseconds x the number of unique input type and excitation current combinations RTD Excitation Current Two current values are user selectable 0 25 mA Recommended for use with higher resistance ranges for both RTDs and direct resistance inputs 1000 RTDs and 3000Q resistance input Refer to RTD manufacturer for recommendations 1 0 mA Recommended to use for all other RTD and direct resistance inputs except 1000Q RTDs and 3000Q resistance input ranges are limited Refer to RTD manufacturer for recommendations Publication 1746 UM003A EN P Spe
57. cted to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance Run RTD and sense wires from module to potentiometer and tie them to one point Cable Shield RTD 0 Frame Ground Sense 0 Return RTD 1 L Sense 1 Return 1 RTD 2 Sense 2 Return 2 b DOOOLOOOEO Belden 83503 or 9533 Shielded Cable Publication 1746 UM003A EN P 2 14 Installation and Wiring Publication 1746 UMO03A EN P Wiring Input Devices to the Module To wire your 1746 NR8 module follow these steps as shown in the illustration below 5 6 At each end of the cable strip some casing to expose the individual wires Trim the signal wires to 5 08 cm 2 inch lengths Strip about 4 76 mm 3 16 inch of insulation away to expose the end of the wire At one end of the cable twist the drain wire and foil shield together bend them away from the cable and apply shrink wrap Then earth ground at the frame ground of the rack At the other end of the cable cut the drain wire and foil shield back to the cable and apply shrink wrap Connect the signal wires to the 1746 NR8 terminal block and the input Repeat steps 1 through 5 for each channel on the 1746 NR8 module Figure 2 5 Shielded Cable 2 Conductor Shielded Cable gt See step 4 Signal Wire i i Chi Signal Wire Signal Wire Drain Wire Foil Shield g l l Signal Wire 3 Conductor Sh
58. e causes listed below the channel LED blinks and bit 13 of the channel status word is set Possible causes of an open or short circuit include The RTD or potentiometer may be broken e An RID or potentiometer wire may be loose or cut e The RTD or potentiometer may not have been installed on the configured channel e The RTD may be internally shorted e The RTD may be installed incorrectly e Wrong RTD used for type configuration selected Module Diagnostics and Troubleshooting 6 5 If an open or short circuit is detected the channel data word reflects input data as defined by the broken input configuration bits 6 and 7 in the channel configuration word Out Of Range Detection Whenever the data received at the channel data word is out of the defined operating range an over range or under range error is indicated and bit 14 of the channel status word is set MIT There is no under range error for a direct resistance input default scaling For a review of the temperature range or resistance range limitations for your input device refer to the temperature ranges provided in Chapter 5 or the user specified range in configuration words 8 through 23 if proportional counts is used Possible causes of an out of range condition include e The temperature is too hot or too cold for the RTD being used e Wrong RTD used for type configuration selected e Bad potentiometer or RTD e Signal input from either potentiometer or
59. e already tried to remedy the problem processor type 1746 NR8 series letter and firmware FRN number See label on left side of processor hardware types in the system including I O modules and chassis fault code if the SLC processor is faulted Publication 1746 UM003A EN P 6 8 Module Diagnostics and Troubleshooting Publication 1746 UM003A EN P Basic Example Chapter 7 Application Examples This chapter provides two application examples to help you use the RTD input module They are defined as a e basic example e supplementary example The basic example builds on the configuration word programming provided in Chapter 5 to set up one channel for operation The module operates in Class 1 mode for this sample This setup is then used in a typical application to display temperature The supplementary example demonstrates how to perform a dynamic configuration of all eight channels The example sets up an application that allows you to manually select whether the displayed RTD input data for any channel is expressed in C or F The module operates in Class 3 operation in order to support the scaling and status The following illustration indicates the temperature of a bath on an LED display The display requires binary coded decimal BCD data so the program must convert the temperature reading from theRTD module to BCD before sending it to the display This application displays the temperature in F Figure 7 1 Device
60. e correct channel setup information to the RTD module based on the position of the degrees selector switch Application Examples 7 7 Figure 7 4 Program to Display Data On LEDs If the degrees selector switch is turned to the Fahrenheit position set up all eight channels to read in degrees Fahrenheit Degrees Selector Switch Fahrenheit x COP Rung 2 0 _ u gt ia COPY FILE 0 0 Source N10 0 Dest 0 1 0 Length 8 If the degrees selector switch is turned to the Celsius position set up all four channels to read in degrees Celsius Degrees Selector Switch Celsius 1 2 0 B3 COP Rung 2 1 1 1 losR COPY FILE 0 1 Source N10 8 Dest 0 1 0 Length 8 TOD Rung 2 2 Ton Source I 1 0 Dest 0 3 0 TOD Rung 2 3 TO BCD Source I 1 1 Dest 0 4 0 TOD TO BCD Source 1 1 2 Rung 24 Dest 0 5 0 TOD Rung 2 5 TO BCD Source 251 3 Dest 0 6 0 TOD Rung 2 6 TO BCD Source I 1 4 Dest 0 7 0 Publication 1746 UM003A EN P Application Examples 1 8 TOD TO BCD Source il 18 Dest TOD TO BCD Source il 9 Dest TOD TO BCD Source ppl 0 10 0 Dest END Rung 2 7 Rung 2 8 Rung 2 9 Rung 2 10 Table 7 5 Data Table 10 11
61. e occurred The LED is ON if there are no module errors The status of each LED during each of the operational states for example powerup module operation and error is depicted in the following table LED Power up Module Operation Module Error Channel No Error Error Ch 0 to 7 Status On On Off off Flashes Mod Status Off On Flashes Off On 1 Module is disabled during powerup 2 Channel status LED is On ifthe respective channel is enabled and Off ifthe channel is disabled 3 Error if channel is enabled Publication 1746 UMOO3A EN P 1 10 Overview Publication 1746 UMO03A EN P Module to Processor Communication As shown in the following illustration the RTD module communicates with the SLC processor through the backplane of the chassis The RTD module transfers data to receives data from the processor by means of an image table The image table consists of eight input words and eight output words when configured for Class 1 operation 16 input words and 24 output words when configured for Class 3 operation Data transmitted from the module to the processor is called the input image for example Channel Data Words and Channel Status Words Conversely data transmitted from the processor to the module is called the output image for example Channel Configuration Words and Scaling Limit Words Details about the input and output images are found in Module Addressing on page 3 2 Figure
62. e on the module to attach it to its backplane connector Never force the module into the slot 3 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 Removing the Module 1 Press the releases at the top and bottom of the module and slide the module out of the chassis slot 2 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 The RTD module contains an 24 position removable terminal block The terminal pin out is shown in the illustration on page 2 8 Publication 1746 UM003A EN P 2 8 Installation and Wiring Terminal Wiring Publication 1746 UMOO3A EN P PME Disconnect power to the SLC before attempting to install remove or wire the removable terminal wiring block To avoid cracking the removable terminal block alternate the removal of the terminal block release screws Figure 2 1 Terminal Block Terminal Block Spare Part Number 1746 RT35 Sense 7 Return 7 QN Q Q Q Q Q Q S Q Q Q 3 S Release Screw Maximum Torque 0 25 Nm 2 25 Ibs in OOOOOO000000000000000000 Wiring Considerations Follow the guidelines below when planning your system wiring Since the operating principle of the RTD module is based on the measurement of resistance take special care in selecting your input cable For 2 wire or 3 wire configuration select a cable that has a consistent impedance throughout its entire length Configurat
63. entiometers to the Module Potentiometer wiring requires the same type of cable as that for the RTD described in the previous subsection Potentiometers can be connected to the RTD module as a 2 wire connection or a 3 wire connection Publication 1746 UM003A EN P 2 12 Installation and Wiring Publication 1746 UMO03A EN P Figure 2 3 2 Wire Potentiometer Connections to Terminal Block For details on wiring a potentiometer to the module see page 2 8 Add Jumper Potentiometer Cable Shield Frame Ground Y Belden 9501 Shielded Cable Sense 7 Return 7 QOODOOOODOOWVCYNPOODOLOVOO a Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance Cable Shield Frame Ground Potentiometer Belden 9501 Shielded Cable Add Jumper Sense 7 Return 7 Goocco0000000000000000000 c Installation and Wiring 2 13 Figure 2 4 3 Wire Potentiometer Connections to Terminal Block For details on wiring a potentiometer to the module see page 2 8 Run RTD and sense wires from module to potentiometer and tie them to one point Potentiometer lt Cable Shield O Frame Ground RTD 0 Sense 0 Return son ken 1 RTD1 Bee I 4 Sense 1 so H Return 1 RTD 2 Sense 2 Return 2 Belden 83503 or 9533 Shielded Cable Potentiometer wiper arm can be conne
64. ers A reference manual that contains status file data instruction set SLC 500 and MicroLogix 1000 Instruction 1747 6 15 and troubleshooting information about APS Set Reference Manual A procedural and reference manual for technical personnel who use Allen Bradley Hand Held Terminal User s 1747 NP002 an HHT to develop control applications Manual An introduction to HHT for first time users containing basic concepts Getting Started Guide for HHT 1747 NM009 but focusing on simple tasks and exercises and allowing the reader to begin programming in the shortest time possible A resource manual and user s guide containing information about the SLC 500 Analog 1 0 Modules User s Manual 1746 6 4 analog modules used in your SLC 500 system In depth information on grounding and wiring Allen Bradley Allen Bradley Programmable Controller 1770 4 1 programmable controllers Grounding and Wiring Guidelines A description of important differences between solid state Application Considerations for Solid State SGl 1 1 programmable controller products and hard wired electromechanical Controls devices A complete listing of current Allen Bradley documentation including Allen Bradley Publication Index SD499 ordering instructions Also indicates whether the documents are available on CD ROM or in multi languages A glossary of industrial automation terms and abbreviations Allen Bradley Industrial Automation Glossary AG 7 1 An article on wire size
65. figuration is done via the user program There are no DIP switches Publication 1746 UMOO3A EN P 1 6 Overview INPUT CHANNEL O m STATUS u MODULE n p ii RTD resistance Publication 1746 UMOO3A EN P Figure 1 2 RTD Module Hardware Nm 8HN 9vZ1 lvo p e1 ALY 00S 91S oor Vv a Ni 31NdOW 1ndNI 99UE wall Spesa 35 5 E Ed 33 E 28 B A fh 1746 NR8 Table 1 4 Hardware Features Item Description Function 1 Channel Status LED Displays operating and fault status of Indicators green channels 0 1 2 3 4 5 6 and 7 2 Module Status LED green Displays module operating and fault status 3 Removable Terminal Block Provides physical connection to input devices Catalog 1746 RT35 4 Cable Tie Slots Secures wiring from module 5 Door Label Provides terminal identification 6 Side Label Nameplate Provides module information 7 Self Locking Tabs Secures module in chassis slot General Diagnostic Features The RTD module contains diagnostic features that can be used to help you identify the source of problems that may occur during power up or during normal channel operation These power up and channel diagnostics are explained in Chapter 6 Module Diagnostics and Troubleshooting The RTD module communicates to the SLC 500 processor through the parallel backplane interface and receives 5V dc a
66. figure eight channels of a RTD module residing in slot 3 of a 1746 chassis Configure the first four channels with one set of parameters and the last four channels with a different set of parameters Figure 5 1 Configuration Word Setup for Channels 0 through 3 2 1 9 8 7 6 5 4 3 2 1 o BitNumber Bit Setting 111011 11010 1 0 0 OF 0 0 Configures Channel For 100 Q Platinum RTD Scaled for PID Broken Input Zero Data Word Degrees Fahrenheit F 50 60 Hz Filter Frequency Channel Enabled 0 25 mA Excitation Current Calibration Enabled Lead R Always Figure 5 2 Configuration Word Setup for Channels 4 Through 7 Configures Channel For U 10 Q Copper RTD 426 Engineering Units x 10 Broken Input Set Upscale Degrees Celsius C 800 Hz Filter Frequency Channel Enabled 0 25 mA Excitation Current Calibration Disabled Lead R Periodic Publication 1746 UM003A EN P Ladder Programming Examples 5 3 This example transfers configuration data and sets the channel enable bits of all eight channels with a single file copy instruction The file copy instruction copies 8 data words from an integer file you create in the SLC s memory to the RTD modules chan
67. formed additional calibrations only need to be performed if the cable is disturbed or degraded RTD replacement should not affect the accuracy of the procedure However periodic autocalibrations should be performed Follow the steps below to perform a single point calibration 1 Cycle power to the SLC 500 chassis 2 Select a calibration temperature that is near the control point 10 C 3 Determine the exact resistance 0 01 Q equivalent to the calibration temperature by using a published temperature vs resistance chart 4 Replace the RTD with the fixed precision resistor We recommend you use a 2 ppm temperature coefficient resistor 5 Use the RTD module to determine the temperature equivalent to the fixed precision resistor and cable combination 6 Calculate the offset value by subtracting the calculated calibration temperature from the measured temperature 7 Reconnect theRTD to the cable 8 Use ladder logic to apply subtract the offset from the measured temperature to obtain corrected temperature Module ID Code Chapter 3 Preliminary Operating Considerations This chapter explains how the RTD module and the SLC processor communicate through the module s input and output image It lists the preliminary setup and operation required before the RTD module can function in a 1746 I O system Topics discussed include how to enter the module ID code address your RTD module select the proper input fil
68. g input signal attenuation The reduction in the magnitude of a signal as it passes through a system channel Refers to one of four small signal analog input interfaces available on the module s terminal block Each channel is configured for connection to an RTD or potentiometer input device and has its own diagnostic status word chassis A hardware assembly that houses devices such as I O modules adapter modules processor modules and power supplies common mode rejection ratio The ratio of a devices differential voltage gain to common mode voltage gain expressed in dB CMRR 20 Logo vi v2 common mode voltage A voltage signal induced in conductors with respect to ground 0 potential configuration word Contains the channel configuration information needed by the module to configure and operate each channel Information is written to the configuration word through the logic supplied in your ladder program cut off frequency The frequency at which the input signal is attenuated 3dB by the digital filter Frequency components of the input signal below the cut off frequency are passed with under 3dB of attenuation data word A 16 bit integer that represents the value of the analog input channel The channel data word is valid only when the channel is enabled and there are no channel errors When the channel is disabled the channel data word is cleared 0 dB decibel A logarithmic measure of the ratio of t
69. he upper range value a configuration error occurs Figure 4 5 Limit Scale Words 0 e 8 Define ower scale limit for Ch 0 s 0 e 9 Defines upper scale limit for Ch 0 0 e 10 Defines lower scale limit for Ch 1 0 e 11 Defines upper scale limit for Ch 1 0 6 12 Defines lower scale limit for Ch 2 0 e 13 Defines upper scale limit for Ch 2 0 e 14 Defines lower scale limit for Ch 3 0 e 15 Defines upper scale limit for Ch 3 0 e 16 Defines lower scale limit fof Ch 4 0 e 17 Defines upper scale limit for Ch 4 0 e 18 Defines lower scale limit for Ch 5 0 e 19 Defines upper scale limit for Ch 5 0 e 20 Defines lower scale limit for Ch 6 0 e 21 Defines upper scale limit for Ch 6 0 e 22 Defines lower scale limit for Ch 7 0 e 23 Defines upper scale limit for Ch 7 Channel Configuration Data and Status 4 11 Scaling Examples The following examples are using the default scaling ranges Scaled for PID to Engineering Units Equation Engr Units Equivalent SLOW SHIcH SLOW x een value pe 16383 Assume that the input type is an RTD Platinum 2009 a 0 00385 C range 200 C to 850 C scaled for PID display type Channel data 3421 Want to calculate C equivalent From Channel Data Word Format Sj ow 200 C and Suyu 850 C Solution E
70. he user program that is Counts Data Format specific to the application Assume that the user controls the line speed of a conveyor using a 1000Q potentiometer connected to channel 0 of the RTD with the User set Scaling module The line speed will vary between 3 feet minute when the Cl ass 3 potentiometer is at 0Q and 50 feet minute when the potentiometer is at 10002 Example Configure the RTD module in Class 3 operation to return a value between 3 and 50 in the data word for channel 0 Proceed as follows 1 Set bits 0 through 3 of configuration word 0 to 1110 to select the 1000 potentiometer input type 2 Set bits 4 and 5 of configuration word 0 to 11 to select proportional counts data format 3 Enter 3 as the low range into N10 8 4 Enter 50 as the high range into N10 9 Figure 5 7 Programming for PID Applications Initialize RTD module COP COPY FILE Source N10 0 Dest 0 3 0 Length 10 First Pass Bit Rung 2 0 Ten elements are copied from the specified source 9 i 4 E address N10 0 to the specified output 0 3 0 Each 15 element is a 16 bit integer as shown in the data table atthe bottom of the page Rung 2 1 The Source of this instruction is the data word from the ti i RTD module which is a number between 3 and 50 The 11 Dest in this application is an analog output channel controlling the speed of the conveyor motor drive The Rate and Offset parameters should be se
71. ielded Cable Signal Wire P 2 y Signal Wire Signal Wire Signal Wire Foil Shield Signal Wire Signal Wire Drain Wire See step 3 Calibration Installation and Wiring 2 15 The accuracy of a system that uses the RTD module is determined by the following the accuracy of the RTD resistance mismatch of the cable wires that connect the RTD to the module the accuracy of the RTD module For optimal performance at the customer site the RTD module is calibrated at the factory prior to shipment In addition an autocalibration feature further ensures that the module performs to specification over the life of the product Factory Calibration The 2 pin calibration connector on the RTD module circuit board is used for factory setup only Autocalibration When a channel becomes enabled the module configures the channel and performs an autocalibration on the module if the combination of input type and excitation current are unique to that channel Autocalibration performs AID conversions on the zero voltage and the full scale voltage of the A D converter IMPORTANT Channel calibration time is shown in Channel Autocalibration on page 3 10 These conversions generate offset zero reference and full scale span reference coefficients that are saved and used by the module to perform future AID conversions You can command your module to perform an autocalibration cycle once every 5 minutes by setting any channel
72. ing Examples Publication 1746 UM003A EN P Module Operation vs Channel Operation Chapter 6 Module Diagnostics and Troubleshooting This chapter describes troubleshooting using the channel status LEDs as well as the module status LED A troubleshooting flowchart is shown on page 6 6 It explains the types of conditions that might cause an error to be reported and gives suggestions on how to resolve the problem Major topics include e module operation vs channel operation e power up diagnostics e channel diagnostics LED indicators troubleshooting flowchart replacement parts contacting Allen Bradley The RTD module performs operations at two levels e module level operations e channel level operations Module level operations include functions such as power up configuration and communication with the SLC processor Channel level operations describe channel related functions such as data conversion and open circuit or short circuit RTDs only detection Internal diagnostics are performed at both levels of operation and any error conditions detected are immediately indicated by the modules LEDs and status to the SLC processor Publication 1746 UM003A EN P 6 2 Module Diagnostics and Troubleshooting Power Up Diagnostics Channel Diagnostics LED Indicators Publication 1746 UMOO3A EN P At module power up a series of internal diagnostic self tests is performed The module status LED remains off dur
73. ing bit 0 0 bit 1 0 bit 2 1 and bit 3 0 in the configuration word 2 Select scaled for PID as the data type by setting bit 4 0 and bit 5 1 in the configuration word Publication 1746 UM003A EN P 5 6 Ladder Programming Examples 0000 0001 0002 ATTENTION When using the module s scaled for PID data format with the SLC PID function ensure that the PID instruction parameters Maximum Scaled Spay word 7 and Minimum Scaled Spin word 8 match the modules minimum and maximum scaled range in engineering units e g 200 C to 850 C for each channel This allows you to accurately enter the setpoint in engineering units C F Figure 5 6 Programming for PID Application Use register N10 0 as configuration word for channel 0 First Pass S 1 MOV J F Move 15 Source N10 0 0 lt Dest 0 3 0 0 lt Entering Address N11 0 allocates elements N11 0 to N11 22 for required Control Block file length of 23 words The Process Variable is address 1 3 0 which stores the value of input data word 0 channel 0 Output of the PID instruction is stored at address N11 23 Control Variable Address 1 3 8 PID JE PID 11 Control Block N11 0 Process Variable 1 3 0 Control Variable N11 23 Control Block Length 23 Setup Screen Publication 1746 UMOO3A EN P C END gt Ladder Programming Examples 5 7 Using the Proportional The RTD module can be set up to return data to t
74. ing power up The channel LEDs are turned on until the self test has finished If any diagnostic test fails the module enters the module error state If all tests pass the module status LED is turned on and the channel status LED is turned on for the respective enabled channel The module continuously scans all enabled channels and communicates with the SLC processor During power up the RTD module does not communicate with the processor When a channel is enabled bit 11 1 a diagnostic check is performed to see that the channel has been properly configured In addition the channel is tested for out of range open circuit and short circuit faults on every scan A failure of any channel diagnostic test causes the faulted channel status LED to blink All channel faults are indicated in bits 13 through 15 of the channel s status word Channel faults are self clearing bits 13 and 14 of status word Bit 15 is not cleared until the correct change is made to the channel configuration The channel LED stops blinking and resumes steady illumination when the fault conditions are corrected IMPORTANT If you clear 0 a channel enable bit 11 all channel status information including error information is reset 0 The RTD module has nine LEDs Eight of these are channel status LEDs numbered to correspond to each of the RTD resistance input channels and one is a module status LED Figure 6 1 LED Display CHANNEL TATU Channel LED
75. ion Recommended Cable 2 wire Belden 9501 or equivalent 3 wire Belden 9533 or equivalent less than 30 48m 100 ft 3 wire Belden 83503 or equivalent greater than 30 48m 100 ft or high humidity conditions Installation and Wiring 2 9 For a 3 wire configuration the module can compensate for a maximum cable length associated with an overall cable impedance of 25 ohms TNT ANS Details of cable specifications are shown on page A 5 Three configurations of RTDs can be connected to the RTD module namely e 2 wire RTD which is composed of 2 RTD lead wires RTD and Return e 3 wire RTD which is composed of a Sense and 2 RTD lead wires RTD and Return e 4 wire RTD which is composed of 2 Sense and 2 RTD lead wires RTD and Return The second sense wire of a 4 wire RTD is left open It does not matter which sense wire is left open Tete he RID module requires three wires to compensate for lead resistance error We recommend that you do not use 2 wire RTDs if long cable runs are required as it reduces the accuracy of the system However if a 2 wire configuration is required reduce the effect of the lead wire resistance by using a lower gauge wire for the cable for example use AWG 16 instead of AWG 24 Also use cable that has a lower resistance per foot of wire The module s terminal block accepts one AWG 14 gauge wire Observe the following wiring guidelines e To limit overall cable impedance keep input
76. ion allows you to directly interface RTD Data into a PID instruction without intermediate scale operations and Proportional Counts selection provides the highest display resolution but also require you to manually convert the channel data to real Engineering Units Channel Configuration Data and Status 4 7 Default scaling can be selected for scaled for PID data format and proportional counts data format User set scaling can be defined for proportional counts data format For a description of default scaling see page 4 7 scaled for PID data format and page 4 8 proportional counts data format For a description of user set scaling using proportional counts data format see page 4 9 The equations on page 4 11 show how to convert from Scaled for PID to Engineering Units Engineering Units to Scaled for PID Proportional Counts to Engineering Units and Engineering Units to Proportional Counts To perform the conversions you must know the defined temperature or resistance range for the channels input type Refer to the Channel Data Word Format in the tables on page 4 13 and page 4 14 The lowest possible value for an input type is Sp oy and the highest possible value is Spi Scaled for PID If the user selects scaled for PID as the data format the data word for that channel is a number between 0 and 16383 Zero 0 corresponds to the lowest temperature value of the RTD type or the lowest resistance value ohms The value 16383 correspond
77. is prohibited Throughout this manual we use notes to make you aware of safety considerations Identifies information about practices or ATTENTION fi P circumstances that can lead to personal injury or death property damage or economic loss Attention statements help you to identify a hazard avoid a hazard recognize the consequences IMPORTANT Identifies information that is critical for successful application and understanding of the product SLC 500 is a trademark of Rockwell Automation PLC 5 is a registered trademark of Rockwell Automation Belden is a trademark of Belden Inc Preface Overview Installation and Wiring Table of Contents Who Should Use This Manual 3n 22 Aa ee coves eo P 1 Purpose of This Manual 4 50 site nas b wb S Lex EE VS P 1 Related Documentation er ues de ario Mr bu Ph Pan P 2 Common Techniques Used in this Manual P 3 Rockwell Automation Supporte ss Let A ae P 3 Local Product Support a a2 hassen P 3 Technical Product Assistance s qot uke dope br aa P 3 Your Questions or Comments on this Manual P 3 Chapter 1 Descriptio ie esre ea Aa a tay Ne eae REG 1 1 RTD Compatibility pressione bea 1 3 Resistance Device Compatibility saus sd Reis 1 5 Hardware Overview sul aan ee 1 5 General Diagnostic Features une sans aan 1 6 Steri OVePVISW autore doo re ed E iis 1 7 System Operation cer eie ERRE IAA ot 1 7 Module to Processor Communica
78. l Communication Dept A602V P O Box 2086 Milwaukee WI 53201 2086 Publication 1746 UM003A EN P Preface 4 Publication 1746 UM003A EN P Description Chapter 1 Overview This chapter describes the 8 channel 1746 NR8 RTD Resistance Input Module and explains how the SLC controller gathers RTD Resistance Temperature Detector temperature or resistance initiated analog input from the module Included is a general description of the modules hardware and software features an overview of system operation For the rest of the manual the 1746 NR8 RT D Resistance Input Module is referred to as simply the RTD module The RTD module receives and stores digitally converted analog data from RTDs or other resistance inputs such as potentiometers into its image table for retrieval by all fixed and modular SLC 500 processors An RTD consists of a temperature sensing element connected by 2 3 or 4 wires that provide input to the RTD module The module supports connections from any combination of up to eight RTDs of various types for example platinum nickel copper or nickel iron or other resistance inputs The RTD module supplies a small current to each RTD connected to the module inputs up to 8 input channels The module provides on board scaling and converts RTD input to temperature C F or reports resistance input in ohms Each input channel is individually configurable for a specific input device Broken sensor detectio
79. le above Failure to heed this caution may result in reduced accuracy of the RTD system Publication 1746 UM003A EN P A 6 Specifications Publication 1746 UM003A EN P Appendix B Configuration Worksheet for RTD Resistance Module See Chapter 4 for worksheet procedure oi Bit Definitions Bit Number Channel 0 Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 nput Type Select Data Format Select Broken Input Select Temperature Units Select Filter Frequency Select Channel Enable Excitation Current Select Calibration Disable Lead R Enable Bits 0 through 3 Input Type Select 0000 1002 Pt 385 0001 2002 Pt 385 0010 500 Pt 385 0011 10000 Pt 385 0100 1000 Pt 3916 0101 2000 Pt 3916 0110 5000 Pt 3916 0111 10000 Pt 3916 1000 109 Cu 426 1001 1200 Ni 618 1010 1209 Ni 672 1011 604 Ni Fe 518 dA C2 CO 0 150Q Potentiometer 1 5000 Potentiometer 0 1000Q Potentiometer 1 30000 Potentiometer Bits 4 and 5 Data Format Select 00 engineering units x1 3 10 scaled for PID 0 to 16383 01 engineering units x10 4 11 proportional counts 32768 to 32767 Bits 6 and 7 Broken Input Select 00 zero 01 upsc
80. m RTD 385 Selector Switch 1 2 0 ul Steamed Pipe Out 7 Steamed Pipe In Publication 1746 UM003A EN P CENE Channel Configuration see completed worksheet on page 7 5 Configuration setup for ambient RTD channels 0 and 4 604Q Nickel Iron 518 display temperature to tenths of a degree Celsius or Fahrenheit zero data word in the event of an open or short circuit 28 Hz input filter to provide 60 Hz line noise rejection use 1 0 mA excitation current for RTD scaling for 20 C to 60 C Bit Definitions Application Examples Configuration setup for bath RTD channels 1 and 5 2009 Platinum RTD 385 display temperature to tenths ofa degree Celsius or Fahrenheit zero data word in the event of an open or short circuit 28 Hz input filter to provide 60 Hz line noise rejection use 1 0 mA excitation current for RTD scaling for 0 C to 60 C define upper and lower temperature limits Configuration setup for steam RTD channels 2 and 6 10000 Platinum RTD 385 display temperature to tenths ofa degree Celsius or Fahrenheit zero data word in the event of an open or short circuit 50 60 Hz input filter to provide 60 Hz line noise rejection use 0 25 mA excitation current for RTD scaling for 20 C to 200 C Configuration setup for chilled H O RTD channels 3 and 7 2009 Platinum RTD 385 display temperature to tenths ofa degree Celsius or Fahrenheit zero data word in the event of an open or short circuit
81. ments of ladder logic specific to unique situations that might apply to your programming requirements The example segments include e initial programming of the configuration word dynamic programming of the configuration word verifying channel configuration changes e interfacing the RTD module to a PID instruction using proportional counts scaling example monitoring channel status bits e invoking autocalibration Device Configuration The following illustration is used for clarification of the ensuing ladder logic examples and is not intended to represent an RTD application apter 7 shows a typical application for the module TYE Chapter 7 shows a typical application for theRTD modul 1746 NR8 RTD Module 1746 0B8 DC Output Module Sourcing 1746 IB8 DC Input Module Sinking en x e RTD 0 xy __ Slot 4 RTD 1 VA Ps ee RID2 Pilot Light 0 2 1 mE E Ch 0 Alarm Ch 1 Alarm Ch 2 Alarm Ch 3 Alarm Le ec El Er Autocalibration on Se m x o N Pilot Light 0 2 2 Display Panel Selector Switch 1 1 0 Pilot Light 0 2 0 _ _ Pilot Light 0 2 3 Push button Switch 1 1 _ u Publication 1746 UM003A EN P 5 2 Initial Programming Ladder Programming Examples To enter data into the channel configuration word O e 0 through O e 7 when the channel is disabled bit 11 0 follow the example below Refer to page 4 5 for specific configuration details Example Con
82. move instruction with the OFFF mask allows you to use outputs 12 13 14 and 15 for other output devices in your system The 7 segment display uses outputs 0 through 11 Rung 2 2 END Table 7 2 Data Table address 15 data 0 address 15 data 0 N10 0 0000 1001 0001 0001 Supplementary Example Application Setup Eight Channels C or F The following illustration shows how to display the temperature of several different RTDs at one annunciator panel A selector switch 1 2 0 allows the operator to choose between displaying data in C and F Each of the displays is a digit 7 segment LED display with the last digit representing tenths of a degree The displays have dc sinking inputs and use a BCD data format Publication 1746 UM003A EN P 7 4 Application Examples Figure 7 3 Device Configuration for Displaying Many RTD Inputs Chilled H20 Pipe In 200 Platinum RTD 385 Chilled H20 Pipe Out Bath 200 Platinum 1000 Platinum RTD 385 RTD 385 umm 1746 NR8 174688 Steamed Pipe Out 8 1746 0B16 Steamed Pipe In SLC 5 04 A 5 1 ON Ambient Temperature N 6040 Nickel Iron 518 Ambient Temperature 6040 Nickel lron 518 s OT Display Panel Chilled H20 Pipe In 2009 Platinum RTD 385 Chilled H20 Pipe Out Bath f 1000 Platinu
83. n open or short circuit is provided for each input channel In addition the module provides indication if the input signal is out of range For more detail on module functionality refer to the subsection entitled System Overview later in this chapter Publication 1746 UMOO3A EN P 1 2 Overview Figure 1 1 Simplified RTD Module Circuit Constant Current Source 10 2500 47 RTD Module RTD 0 RTD eturn uejdy eg A D Conversion uP Circuit K Digital Data RTD 1 RTD eturn RTD 2 GI Return RTD RTD 3 RTD eturn RTD 4 RTD5 E eturn RTD RTD 6 G Return RTD 7 GY Return Publication 1746 UM003A EN P Overview 1 3 RTD Compatibility The following table lists the RTD types used with the RTD module and gives each types associated temperature range resolution and repeatability specifications The next table shows the accuracy and temperature drift specifications for the RT Ds Table 1 1 RTD Temperature Ranges Resolution and Repeatability Input Type Temp Range Temp Range Resolution Repeatability 0 25 mA Excitation 1 0 mA Excitation 28 Hz 50 60 Hz Platinum 385 2 1000 200 C to 850 C 200 C to 850 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 1562 F 0 1 F 0 4 F 2000 200 C to 850 C 200 C to
84. nable 0 channel disabled 1 channel enabled Bit 12 Excitation Current Select 0 1 0 mA 120 25 mA Bit 13 Cal Disable 0 enable 1 disable Bits 14 and 15 LeadR Disable 00 disable 01 periodic 10 always 1 Actual value at C is 9 042Q per SAMA standard RC21 4 1966 2 Actual value at 0 C is 100Q per DIN standard 3 Values are in 0 1 step or 0 1 Q step for all resistance input types except 150Q For the 150Q resistance input type the values are in 0 01Q step 4 Values are in 1 step or 1Q step for all resistance input types except 1509 For the 150Q resistance input type the values are in 0 1Q step Publication 1746 UMO003A EN P Program Listing Since a 7 segment LED display is used to display temperature the temperature data must be converted to BCD The 16 bit data word representing the temperature value is converted into BCD values by the program shown in the following illustration Figure 7 2 Program to Convert Fto BCD First Pass Bit Application Examples 1 3 Initialize Channel 0 of Rung 2 0 RTD Module S 1 MOV t MOVE 15 Source N10 0 Dest 0 3 0 Convert the channel 0 data word degrees F to BCD values and write this to the LED display If channel 0 is ever disabled a zero is written to the display Rung 2 1 TOD TO BCD Source I 3 0 Dest N7 0 uve MASKED MOVE Source N7 0 Mask OFFF Dest 0 2 0 1 The use of the masked
85. ncrements of the channel data word These may be scaled for PID or Engineering Units for RTD or potentiometer inputs which are automatically scaled They may also be proportional counts which you must calculate to fit your applications temperature or resistance resolution local configuration A control system where all the chassis are located within several feet of the processor and chassis to chassis communication is via a 1746 C7 or 1746 C9 ribbon cable LSB Least Significant Bit Refers to a data increment defined as the full scale range divided by the resolution The LSB represents the smallest value within a string of bits multiplexer switching system that allows several input signals to share a common A D converter normal mode rejection differential mode rejection A logarithmic measure in dB of a devices ability to reject noise signals between or among circuit signal conductors but not between equipment grounding conductor or signal reference structure and the signal conductors potentiometer Pot A variable resistor that can be connected to the RTD module remote configuration control system where the chassis can be located several thousand feet from the processor chassis Chassis communication is via the 1747 SN Scanner and 1747 ASB Remote I O Adapter Glossary 3 resolution The smallest detectable change in a measurement typically expressed in engineering units e g 0 1 C or as a number
86. nd 24V dc power from the SLC 500 power supply through the backplane No external power supply is required You may install as many RTD modules in your system as the power supply can support as shown in the illustration below System Overview Overview 1 7 Figure 1 3 RTD Configuration RTD Modules SLC Processor Dana Each individual channel on the RTD module can receive input signals from 2 3 or wire RTD sensors or from resistance input devices You configure each channel to accept either input When configured for RTD input types the module converts the RTD readings into linearized digital temperature readings in C or E When configured for resistance inputs the module provides a linear resistance value in ohms Tete he RID module is designed to accept input from RTD sensors with up to 3 wires When using 4 wire RTD sensors one of the 2 lead compensation wires is not used and the wire sensor is treated like a 3 wire sensor Lead wire compensation is provided via the third wire Refer to Wiring Considerations on page 2 8 for more information System Operation The RTD module has 3 operational states power up module operation error module error and channel error Publication 1746 UMOO3A EN P 1 8 Overview Publication 1746 UMO03A EN P Power up At power up the RTD module checks its internal circuits memory
87. nel configuration words This procedure is described below Figure 5 3 Copy File Data Flow Address Source Data File Address Destination Data File NIO 0 Channel Configuration Word 0 0 30 NIO 1 Channel Configuration Word 1 031 NIO 2 Channel Configuration Word 2 gt 032 Channel Qu put Word 2 NIO 3 Channel Configuration Word 3 gt 033 NIO 4 Channe iguration Word 4 034 NIO 5 Channel Configuration Word 5 gt 0 35 Channel Output Word 5 uns ILS 03s NIO 7 Channel Configuration Word 7 037 Procedure 1 Using the memory map function to create a data file create integer file N10 Integer file N10 should contain eight elements N10 0 through N10 7 2 Using the RSLogix 500 data monitor function enter the configuration parameters for all eight RTD channels into a source integer data file N10 Refer to the Configuration Word Setup illustration for the bit values See Appendix B for a channel configuration worksheet Bit 15 14 13 12 11 10 9 8 1 6 5 4 3 2 1 0 N10 0 1 0 1 1 0 1 1 0 0 1 0 0 0 0 0 N10 1 1 0 1 0 1 1 0 0 1 0 0 0 0 0 N10 2 1 0 1 0 1 1 0 0 1 0 0 0 0 0 N10 3 1 0 1 0 1 1 0 0 1 0 0 0 0 0 N 10 4 0 1 0 1 0 0 0 1 0 1 1 0 0 0 N10 5 0 1 0 1 0 0 0 1 0 1 1 0 0 0 N10 6 0 1 0 1 0 0 0 1 0 1 1 0 0 0 N10 7 0 1 0 1 0 0 0 1 0 1 1 0 0 0 3 Use the copy file instruction COP to cop
88. ng a channel s lead resistance enable bits to 10 enables measurement of the lead resistance on each acquisition cycle 9 Build the channel configuration word using the configuration worksheet on page B 1 for every channel on each RTD module repeating the procedures given in steps 1 through 9 Enter the Configuration Data Following the steps outlined in Chapter 5 Ladder Programming Examples enter your configuration data into your ladder program and copy it to the RTD module Define Input type selection Channel Configuration Data and Status Table 4 1 Channel Configuration Word 0 e 0 through 0 e 7 Bit Definitions Make these bit settings in the Channel Configuration Word To Select 45 15 14 13 12 11 10 9 1 6 5 4 100 Pt 385 200 Pt 385 500 Pt 385 1000 Pt 385 100 Pt 3916 200 Pt 3816 500 Pt 3916 1000 Pt 3916 Ol CO Ol o o o o 10 Cu 426 120 Ni 6182 ol ol Ol 120 Ni 672 604 NiFe 518 150Q Resistance Input 5009 Resistance Input 1000 Resistance Input af o SL 5 O o O N ol ol 30009 Resistance Input Data format selection Engineering units x 18 Engineering units x 10 Scaled for PID proportional counts CO o Broken input selection Set to Zero
89. ngr Units Equivalent 200 C esc 200 C x iex 19 25 C Engineering Units to Scaled for PID Equation Scaled for PID Equivalent 16383 x ae Units desired am SHIGH SLOW Assume that the input type is an RTD Platinum 2009 a 0 00385 C range 200 C to 850 C scaled for PID display type Desired channel temperature 344 C Want to calculate Scaled for PID equivalent From Channel Data Word Format S1 ow 200 C and SHIGH 850 C Solution 344 C 200 C Scaled for PID Equivalent 16383 x 850 C 200 C 8488 Publication 1746 UM003A EN P 4 12 Channel Configuration Data and Status Proportional Counts to Engineering Units Equation Engr Units Equivalent SLOW SHIGH SLOW x overtone Counts value displayed 2768 65536 Assume that input type is a potentiometer 10009 range 0 to 10009 proportional counts display type Channel data 21567 Want to calculate ohms equivalent From Channel Data Word Format S1 oy 02 and Spicy 10000 Solution 826 ohms Engr Units Equivalent 0 Q tico ohms 0 ohms x Se mul Engineering Units to Proportional Counts Equation Proportional Counts Equivalent fessa x en l 32768 Assume that input type is a potentiometer 30009 range 0 to 3000Q proportional counts display type Desired channel resistance value 1809 Q Want to calculate Proportional Counts equivalent From Channel Da
90. o 500 F 328 F to 500 F 0 1 F 0 2 F Nickel 672 1200 80 C to 260 C 80 C to 260 C 0 1 C 0 1 C 328 F to 500 F 328 F to 500 F 0 1 F 0 2 F Nickel Iron 518 6040 200 C to 200 C 200 C to 180 C 0 1 C 0 1 C 328 F to 392 F 328 F to 338 F 0 1 F 0 2 F 2 Actual value at 0 C is 9 042Q per SAMA standa 3 Actual value at 0 C is 100Q per DIN standard d RC21 4 1966 4 The temperature range for the 1000Q RTD is dependent on the excitation current IMPORTANT 1 The digits following the RTD type represent the temperature coefficient of resistance x which is defined as the resistance change per ohm per C For instance Platinum 385 refers to a platinum RTD with 0 00385 ohms ohm C or simply 0 00385 C The exact signal range valid for each input type is dependent upon the excitation current magnitude that you select when configuring the module For details on excitation current refer to page A 2 Publication 1746 UM003A EN P A 4 Specifications RTD Accuracy and Temperature Drift Specifications Input Type 0 25 mA Excitation 1 0 mA Excitation Accuracy Temperature Drift Accuracy Temperature Drift Platinum 1000 0 5 C 0 012 C C 0 7 C 0 020 C C 385 9 0 9 F 0 012 F F 1 3 F 0 020 F F 2000 0 6 C 0 015 C C 0 7 C 0 020 C
91. oducts You should understand programmable controllers and be able to interpret the ladder logic instructions required to control your application If you do not contact your local Allen Bradley representative for information on available training courses before using this product This manual is a reference guide for the 1746 NR8 RTD Resistance Input Module The manual gives you an overview of system operation explains the procedures you need to install and wire the module at the customer site provides ladder programming examples provides an application example of how this input module can be used to control a process Publication 1746 UMOO3A EN P Preface 2 Related Documentation The following documents contain information that may be helpful to you as you use Allen Bradley SLCTM products To obtain a copy of any of the Allen Bradley documents listed contact your local Allen Bradley office or distributor For Read this Document Document Number An overview of the SLC 500 family of products SLC 500 System Overview 1747 50001A US P A description on how to install and use your Modular SLC 500 Installation and Operation Manual for 1747 6 2 programmable controller Modular Hardware Style Programmable Controllers A description on how to install and use your Fixed SLC 500 Installation amp Operation Manual for Fixed 1747 6 21 programmable controller Hardware Style Programmable Controll
92. of the RTD module s output image as shown in the illustration below Output words 0 through 7 correspond to channels 0 through 7 on the module Setting the condition of bits 0 through 15 in these words via your ladder logic program causes the channel to operate as you choose for example RTD type reading in C Output words 8 through 23 Class 3 only are used to further define the channel configuration to allow you to choose a scaling format other than the module default when using the proportional counts data format You can use words 8 and 9 to define a user set range for channel 0 words 10 and 11 for channel 1 etc A bit by bit examination of the configuration word is provided in the table on page 4 5 Programming is discussed in Chapter 5 Addressing is explained in Chapter 3 Publication 1746 UMOO3A EN P 4 2 Channel Configuration Data and Status Figure 4 1 Module Output Image Configuration Word 15 0 e 0 Channel 0 Config uration Word 0 e 1 Channel 1 Configuration Word 0 e 2 Channel 2 Config uration Word 0 e 3 Channel 3 Configuration Word 0 e 4 Channel 4 Configuration Word 0 e 5 Channel 5 Configuration Word 0 e 6 Channel 6 Configuration Word 0 e 7 Channel 7 Configuration Word Class 3 Operation Only 0 e 8 Channel 0 Lower Scale Limit 0 e 9 Channel
93. on Set Reference Manual publication 1747 6 15 a XX Chassis Slot Number Hex YY Error Code Hex Publication 1746 UM003A EN P 6 4 Module Diagnostics and Troubleshooting Publication 1746 UMOO3A EN P Channel Status LEDs Green The channel LED is used to indicate channel status and related error information contained in the channel status word This includes conditions such as e normal operation e channel related configuration errors e broken input circuit errors such as open or short circuit RTDs only e out of range errors All channel errors are recoverable errors and after corrective action normal operation resumes Invalid Channel Configuration Whenever a channels configuration word is improperly defined the channel LED blinks and bit 15 of the channel status word is set Configuration errors occur for the following invalid combinations e Input type is a 100 Copper RTD and the excitation current is set for 0 25 mA which is not allowed ead R Enable bits 14 and 15 are set to 11 which is invalid Broken Input select bits 6 and 7 are set to 11 which is invalid Data format bits are set to 11 and the lower limit user set scale is equal to the upper limit user set scale and not equal to 0 Open and Short Circuit Detection An open or short circuit test is performed on all enabled channels on each scan Whenever an open circuit or short circuit condition occurs see possibl
94. ons It has been designed and tested to meet the following directives EMC Directive This product is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility EMC and the following standards in whole or in part documented in a technical construction file e EN 50081 2 EMC Generic Emission Standard Part 2 Industrial Environment e EN 50082 2 EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use in an industrial environment Publication 1746 UMOO3A EN P 2 2 Installation and Wiring Safety Considerations Publication 1746 UMOO3A EN P Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins or other sensitive areas Guard against electrostatic damage by observing the precautions listed next ATTENTION Electrostatic discharge can degrade performance or cause permanent damage Handle the module as stated below e Wear an approved wrist strap grounding device when handling the module e Touch a grounded object to rid yourself of electrostatic charge before handling the module Handle the module from the front away from the backplane connector Do not touch backplane connector pins e Keep the module in its static shield bag when not in use or during shipment Hazardous Location Considerations This equipment is suitable for use in Class I Division 2 Groups A
95. or the RTD module assuming that the module is running normally and more than one channel is enabled The scanning cycle is shown for the situation where channels 0 and 1 are enabled and channels 2 through 7 are not used Channel scan time is a function of the filter frequency as shown in the following table Table 3 3 Channel Scan Time Filter Frequency Channel Scan Time With Lead Resistance 28 Hz 125 ms 250 ms 50 60 Hz 75 ms 147 ms 800 Hz 10 ms 18 ms 6400 Hz 6 ms 10 ms 1 The module scan time is obtained by summing up the channel scan time for each enabled channel For example if 3 channels are enabled with lead resistance and the 50 60 Hz filter is selected the module scan time is 3 x 147 ms 441 ms The fastest module update time occurs when only one channel with a 6400 Hz filter frequency is enabled and lead resistance measurement is disabled Module Update Time 6 ms With 3 channels enabled the module update time is 3 channels x 6 ms channel 18 ms The slowest module update time occurs when eight channels each using a 28 Hz filter frequency and with lead resistance measurement always enabled Module Update Time 8 x 250 ms 2000 ms Preliminary Operating Considerations 3 11 Figure 3 7 Scanning Cycle Channel 1 Channel 0 LI Start J i Wait for Channel 0 A D Conversion Update Channel 1 Data Word Calculate Channel 1 Data Configure and Start Channel
96. ord Output Image Image Channel 6 Configuration Word 8 Words Channel 7 Configuration Word Input Image Address Input Image 8 Words Channe Word 0 e 0 nput Channel 1 Data Word Word 1 e 1 image Channel 2 Data Word Word 2 8 2 Channel 3 Data Word Word 3 6 3 Channel 4 Data Word Word 4 24 Channel 5 Data Word Word 5 0 5 Channel 6 Data Word Word 6 0 6 Channe Word 7 e 7 Bit 15 Bit 0 Publication 1746 UM003A EN P Preliminary Operating Considerations 3 3 Figure 3 2 Class 3 Memory Map Bit 15 Bit 0 Address Wordd Oe Word Ore Channel 2 Configuration Word Word 2 0 e 2 Channel 3 Configuration Word Word 3 0 e 3 Channel 4 Configuration Word Word 4 0 e 4 annel 5 Configuration Word Word 5 0 e 5 Channel 6 Configuration Word Word 6 0 e 6 Word 7 0 27 Word8 0 88 upper scale limit range 0 Word 9 0 e 9 Word10 O e 10 Wordll Diet ower scale Timit range Word 12 0 e 12 upper scale limit range Word 13 0 e 13 ower scale im Word 14 0 e 14 upper scale Im Word 15 0 e 15 Ower Scale Nm Word 16 0 e 16 Word17 0 8 17 we Word18 Cet SLC 5 0X Module ni b E n Data Files Tower scale Tiitvanae Wor e Output Image Table dal Upper scale limit range 6 Word 21 De 21 Word 22 O e 22 Output Image Word 23 0 e 23 24 Words AN Address Input Image T Channel 0 Data Word Word 0 l e 0 Input Image 16 Words Channel Data Word Word1 l e
97. ored Publication 1746 UM003A EN P 4 4 Channel Configuration Data and Status Publication 1746 UMO03A EN P 5 Determine the desired input filter frequency for the channel and enter the 2 digit binary code in bit field 9 and 10 Filter Frequency Selection of the channel configuration word A lower filter frequency increases the channel update time but also increases the noise rejection and channel resolution A higher filter frequency decreases the channel update time but also decreases the noise rejection and channel resolution 6 Determine which channels are used in your program and enable them Place a one in bit 11 channel Enable if the channel is to be used Place a zero in bit 11 if the channel will not be used 7 Select the excitation current for the input channel A zero in bit 12 provides an excitation current of 1 0 mA a 1 provides 0 25 mA Select the excitation current value based on RTD vendor recommendations and the Input Specifications table page A 2 8 Select the lead resistance measurement option The module can disable lead resistance measurement periodically measure the lead resistance or measure the lead resistance on each acquisition for each one of the 8 channels Setting a channel s lead resistance enable bits to 00 disables the lead resistance measurement Setting a channel lead resistance enable bits 01 enables the periodic measurement of the lead resistance which occurs once every 5 minutes Setti
98. ormat bit field lets you define the format for the channel data word contained in the module input image Valid data types are engineering units scaled for PID and proportional counts If you select proportional counts and are operating in Class 3 you have the option of using user defined scaling output registers O 8 through O 23 Unless you specify otherwise the data is scaled to the full scale range for that channel Table 4 2 Bit Descriptions for Data Format Select Binary Select Description Value 00 engineering units x 1 Express values in 0 1 degree or 0 1Q or 0 01Q for 15002 pot only 01 engineering units x 10 Express values in 1 degree or 1Q or 0 1Q for150Q pot only 10 scaled for PID The input signal range for the selected input type is its full scale input range The signal range is scaled into a 0 to 16383 range which is what the SLC processor expects in the PID function 11 proportional counts The input signal range is proportional to your selected input type and scaled into a 32768 to 32767 range default or user set range based on the scale limit words 0 e 8 to 0 e 23 Using Scaled For PID and Proportional Counts Formats The RTD module provides eight options for displaying input channel data These are 0 1 E 0 1 C 1 E 1 C 0 19 19 Scaled for PID and Proportional Counts The first six options represent real engineering units and do not require explanation The Scaled for PID select
99. p 1 Table 4 17 Channel Data Word Resolution for 604Q Nickel Iron 518 Excitation Current Data Format Bits 4 and 5 Engineering Units x 1 Engineering Units x Scaled for PID Proportional Counts 10 Default eC F eC F C F C F 0 25 mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0183 C step 0 0330 F step 0 0046 C step 0 0082 F step 1 0mA 0 1 C step 0 1 F step 1 C step 1 F step 0 0232 C step 0 0417 F step 0 0058 C step 0 0104 F step 1 Publication 1746 UMOD3A EN P 4 16 Channel Configuration Data and Status Publication 1746 UMOO3A EN P The following two tables show the data resolution provided by the 1746 NR8 for resistance input types using the various data formats Table 4 18 Channel Data Word Resolution for 150Q Resistance Input Resistance Data Format Bits 4 and 5 Input Type Engineering Units Engineering Scaled for PID Proportional x1 Units x 10 Counts Default Ohms Ohms Ohms Ohms 1500 0 01Q step 0 1Q step 0 0092Q step 0 0023Q step Table 4 19 Channel Data Word Resolution for 5000 10000 and 30000 Resistance Inputs Resistance Data Format Bits 4 and 5 Input Type Engineering Units Engineering Scaled for PID Proportional x1 Units x 10 Counts Default Ohms Ohms Ohms Ohms 500Q 0 1Q step 1Q step 0 0305Q step 0 0076Q step 1000Q 0 1Q step 1Q step 0 0610Q step 10 0153Q step 30000 0 1Q step 1Q step 0 1831Q step
100. s MODULE _ RTD resistance Error Codes Module Diagnostics and Troubleshooting 6 3 The following tables explain the function of the channel status LEDs while the module status LED is turned on Table 6 1 Module Status Description If Module Indicated Condition Corrective Action Status LED is ON Proper Operation No action required Off or Flashing Module Fault Cycle power If condition persists replace the module or call your local distributor or Rockwell Automation for assistance Table 6 2 Channel Status Description LED Power up Module Operation Module Error Channel No Error Error Ch0 7 Status On On Off Offl3 Flashes Mod Status Off On Flashes Off On 1 Module is disabled during powerup 2 Channel status LED is On ifthe respective channel is enabled and Off ifthe channel is disabled 3 Error if channel is enabled I O error codes are reported in word S 6 of the SLC processor status file The format for the error codes in the status word S 6 is shown in the illustration below The characters denoted as XX in the illustration below represent the slot number Hex for the module The characters denoted as YY represent the 2 digit hex code for the fault condition The error codes applicable to the RTD Module range from 50H to 5AH Some of these are non recoverable errors For a description of the error codes refer to SLC 500 and MicroLogix 1000 Instructi
101. s Counts 432767 Channel Configuration Data and Status 4 9 User Set Scaling Proportional Counts If the user wants to configure the module to scale the data word to something other than 32 768 to 32 767 the user defines what the upper and lower limits are going to be However the maximum range remains 32 768 to 32 767 The user defines what the upper and lower limits are going to be by placing the range in the user set scaling words for that channel The module scales the input data to the upper and lower limit in an linear relationship The following example clarifies this feature In this example the RTD module channel that is configured for user set scaling is channel 3 As shown in the following illustration the user has programmed the channel 3 configuration word for 1000Q potentiometer bits 0 to 3 proportional counts data format bits 4 and 5 and configuration words 14 and 15 for scaling The program for the following example is described on page 5 4 in chapter 5 The user desires to control the line speed of a conveyor A 1000Q potentiometer is used to sense the conveyor line speed The line speed varies between 3 ft minute 0 ohms and 50 ft minute 1000 ohms As shown in the illustration on below the user selects a 1000Q potentiometer as the input type If the user chooses engineering units as the data format the module data word is a value between 0 and 1000 ohms However if the user choo
102. s 0 1 Q 1 00 Default 500Q 0 to 5000 0 to 500 0 to 16383 32768 to 32767 10002 0 to 10000 0 to 1000 0 to 16383 32768 to 32767 1 When ohms are selected the temperature units selection bit 8 is ignored Excitation Current Table 4 11 Data Format for 3000Q Resistance Input Data Format Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional Counts Default 0 1 al 109 0 25 mA Oto 30000 0 to 3000 0 to 16383 32768 to 32767 1 0mA Oto 12000 0 to 1200 0 to 16383 32768 to 32767 1 When ohms are selected the temperature units selection bit 8 is ignored The following table shows the data resolution provided by the 1746 NR8 for RTD input types using the various data formats The table applies to both 0 25 and 1 0 mA excitation currents The data resolution of the remaining RTDs vary with excitation current Table 4 12 Channel Data Word Resolution for RTDs RTD Input Type Data Format Bits 4 and 5 Engineering Units x 1 Engineering Units x Scaled for PID Proportional Counts 10 Default C F C F C F C F 100 Platinum 385 0 1 C step 0 1 F step 1 C step 1 F step 0 0641 C step 0 1154 F step 0 0160 C step 0 0288 F step 2000 Platinum 385 0 1 C step 0 1 F step 1 C step 1 F step 0 0641 C step 0 1154 F step 0 0160 C step 0 0288 F step 1009 Platinum 3916 0
103. s 6 3 errors 6 4 detecting channel related errors 6 4 configuration error 6 4 open circuit 6 4 over range error 6 5 under range error 6 5 detecting module related errors 6 5 conditions tested at power up 6 5 over range error 6 5 examples how to address configuration word 3 4 how to address data word 3 5 how to address status word 3 5 excitation current 4 23 G 2 bit description in status word 4 23 definition G 2 Publication 1746 UM003A EN P ii Index specifications 4 2 F filter frequency G 2 bit description in configuration word 4 17 bit description in status word 4 23 full scale error G 2 full scale range G 2 G gain drift G 2 gain error G 2 gain error See full scale error G 2 grounding cable shield 2 9 guidelines 2 9 H hardware overview 1 5 heat considerations 2 5 ID code 3 7 Input channel multiplexing 7 8 input data scaling G 2 Input device type 4 6 bit description in configuration word 4 6 bit description in status word 4 22 input filter See filter frequency G 2 input response to slot disabling 3 12 installation 2 7 2 7 heat and noise considerations 2 5 in modular chassis 2 3 L LED indicators 7 5 channel status 7 6 module status 7 6 state tables 6 3 local configuration G 2 LSB G 2 manuals related P 2 module ID code Publication 1746 UM003A EN P how to enter 3 7 module operation 7 8 module to processor communication channel data word 7 10 multiplexing 7 8 multiplexor G 2 norm
104. s and types for grounding electrical equipment National Electrical Code Published by the National Fire Protection Association of Boston MA Publication 1746 UMOO3A EN P Common Techniques Used in this Manual Rockwell Automation Support Preface 3 The following conventions are used throughout this manual Bulleted lists such as this one provide information not procedural steps e Numbered lists provide sequential steps or hierarchical information Italic type is used for emphasis Rockwell Automation offers support services worldwide with over 75 Sales Support Offices 512 authorized Distributors and 260 authorized Systems Integrators located throughout the United States alone plus Rockwell Automation representatives in every major country in the world Local Product Support Contact your local Rockwell Automation representative for sales and order support product technical training warranty support support service agreements Technical Product Assistance If you need to contact Rockwell Automation for technical assistance please review the information in the Module Diagnostics and Troubleshooting chapter first Then call your local Rockwell Automation representative Your Questions or Comments on this Manual If you have any suggestions for how this manual could be made more useful to you please contact us at the address below Rockwell Automation Control and Information Group Technica
105. s only specific combinations of modules If you are using the RTD module in a 2 slot expansion chassis with another SLC I O or communication module refer to the table at the left to determine whether the combination can be supported IMPORTANT When using the table be aware that there are certain conditions that affect the compatibility characteristics of the BASIC module BAS and the DH 485 RS 232C module KE When you use the BAS module or the KE module to supply power to a 1747 AIC Link Coupler the link coupler draws its power through the module The higher current drawn by the AIC at 24V dc is calculated and recorded in the table for the modules identified as BASn BAS networked or KEn KE networked Make sure to refer to these modules if your application uses the BAS or KE module in this way Installation and Wiring 2 5 General Considerations Most applications require installation in an industrial enclosure to reduce the effects of electrical interference RTD inputs are susceptible to electrical noises due to the small amplitudes of their signal Group your modules to minimize adverse effects from radiated electrical noise and heat Consider the following conditions when selecting a slot for the RTD module Position the module in a slot away from power lines load lines and other sources of electrical noise such as hard contact switches relays and AC motor drives e away from modules which generate signific
106. s to the highest temperature value for that RTD or the highest resistance value ohms For example if a 1000 Platinum RTD 0 003916 is selected then the relationship of temperature and module counts is Temperature Counts 200 C 0 630 C 16383 The following illustration shows the linear relationship between output counts and temperature when one uses scaled or PID data format Figure 4 2 Linear Relationship Between Temperature and PID Counts Counts Publication 1746 UM003A EN P 4 8 Channel Configuration Data and Status Publication 1746 UMOO3A EN P Proportional Counts Data Format If the user selects proportional counts data format and uses the default limits of 0 the data word for that channel is a number between 32 768 and 32 767 This provides the greatest resolution of all scaling options The value 32 768 corresponds to the lowest temperature value of the RTD type or the lowest resistance value ohms The value 32 767 corresponds to the highest temperature value for that RTD or the highest resistance value ohms For example if a 100 Q Platinum RTD 3916 is selected then the relationship of temperature and module counts is Temperature Counts 200 C 32768 630 C 32767 The following illustration shows the linear relationship between output counts and temperature when one uses proportional counts data format Figure 4 3 Linear Relationship Between Temperature and Proportional Count
107. ses the proportional counts data format and utilizes the user set scaling feature the number 3 can be entered in O e 14 and the number 50 in O e 15 In this situation the RTD module returns a number between 3 and 50 in its data word This action saves the user time in ladder programming Figure 4 4 User set Scaling Using Proportional Counts Data Format Selected Proportional Counts Data Format la Ss Selected 10009 Pot N Channel 3 Configuration Word gt 0e3 0 01001110 OF 0 0 0 1 1 1 1 1 0 Channel 3 amarsi eee ol 0 8 8 5 22157115 or Range Upper scale limit set EN eb En ae wl olololi l lolol ilo Publication 1746 UM003A EN P 4 10 Channel Configuration Data and Status Publication 1746 UMO03A EN P Channel 0 Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Configuration Words For User set Scaling Words 8 to 23 The following illustration shows the address of the user set limit scale words used to define the lower value and the upper value of the user set scale words You can use the words for a channel when proportional counts mode is selected for that channel Any time proportional counts is selected and the upper limit is not zero but is equal to the lower limit a configuration error occurs For example if both scaling limits are 0 or if the lower range value is greater than or equal to t
108. ss than 50 of the selected current e Short circuit calculated lead wire compensated RTD resistance is less than 3 ohms The open circuit error is active for all RTD and resistance inputs while the short circuit error is valid only for RTD inputs Ifa broken input is detected the module sends either zero upscale or downscale data to the channel data word for that channel depending on your channel configuration bits 6 and 7 A broken input error takes precedence over an out of range error states There is not an out of range error when an open circuit or short circuit is detected This bit is cleared if the channel is disabled or if the channel operation is normal Publication 1746 UM003A EN P 4 24 Channel Configuration Data and Status Publication 1746 UMOO3A EN P Out Of Range Error Bit 14 This bit is set 1 whenever a configured channel detects an over range condition for the input channel data regardless of input type This bit is also set 1 whenever the module detects an under range condition when the input type isan RTD An out of range error is declared for either of the following conditions Over range The RTD temperature is greater than the maximum allowed default or user set temperature or the resistance input type is greater than the maximum allowed default or user set resistance When this occurs the channel data word is set to its maximum value e Under range The RTD temperature is less than
109. t an alarm in the processor if one of the RTDs or resistance input devices such as a potentiometer opens or shorts An open circuit error can occur ifthe RTD or resistance input device breaks or one of the RTD or resistance input device wires get cut or disconnected from the terminal block A short circuit condition applies only to RTD input Publication 1746 UMOO3A EN P Ladder Programming Examples Figure 5 8 Programming to Monitor Channel Status First Pass S1 COP 0000 Copy File 15 Source N10 0 Dest 0 3 0 Length 8 Channel 0 Channel 0 Channel 0 Enable Broken Input Alarm 1 3 8 3 8 0 2 0001 4 C gt 11 13 0 1746 0 16 Channel 0 Out of Range 1 3 8 J E 14 Channel 0 Configuration Error 1 3 8 j 5 Channel 1 Channel 1 Channel 1 Enable Broken Input Alarm 13 9 3 9 0 2 0002 TE E CS a 2 11 3 1 1746 0 16 Channel 1 Out of Range 1 3 9 J 4 Channel 1 Configuration Error 1 3 9 JE 5 Publication 1746 UM003A EN P 5 9 5 10 Ladder Programming Examples Channel 7 Channel 7 Channel 7 Enable Broken Input Alarm _1 3 15 1 3 15 0 2 0003 4 C gt 11 13 7 1746 0 16 Channel 7 Out of Range 3 15 TE E 14 Channel 7 Calibration Error 3 15 E 0004 C END gt Invoking Autocalibration Publication 1746 UMOO3A EN P Autocalibration occurs whenever power is provided to the module
110. t per your application Refer to the SLC 500 and MicroLogix 1000 Instruction Set Reference Manual publication 1747 6 15 or the Analog 1 0 User Manual publication 1746 6 4 for specific examples of the SLC instruction Rung 2 2 END SCL SCALE E Source I 3 0 Rate 10000 Offset Dest For Class 3 operation registers N10 8 and N10 9 can be used to scale channel 0 for a minimum conveyor speed of 3 ft minute and a maximum conveyor speed of 50 ft minute Publication 1746 UM003A EN P 5 8 Ladder Programming Examples Table 5 1 Data Table Class 3 Address 10 0 c A amp N 11 e c A N 10 1 10 2 10 3 10 4 10 5 10 6 o o ao O O oO oO 10 7 S ao QoQ oO CO OO oq oO CO 10 8 2 S ojl oj ojl ojlo OF OO 00 Pf CO CO OO ojl ojl CO OT Ol Oll 0 0 ol on Z Z Z Z Z Z Z Z Z Z o o o o o o lo Ga rS lS ojojoj ao of ojojoj CO DLG CSS of Of lo o o o o o o lo OO oq OO oq oO OO Q0 CO OO oq 10 9 Monitoring Channel Status The following illustration shows how to monitor the open and short circuit Bits error bits of each channel and se
111. ta Word Format 1 ow 0Q and Sugu 3000Q Solution Prop Counts 65536 x 1809 ohms 0 ohms 32768 650 The following table shows the temperature ranges of several 1746 NR8 RTDs The table applies to both 0 25 and 1 0 mA excitation currents The temperature ranges of the remaining RTDs vary with excitation current for example 1000Q Platinum 385 1000Q Platinum 3916 and 10Q Copper 426 Publication 1746 UM003A EN P Channel Configuration Data and Status 4 13 Table 4 3 Data Formats for RTD Temperature Ranges for 0 25 and 1 0 mA Excitation Current RTD Input Type Data Format Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional Counts 0 1 C 0 1 F 1 0 C 1 0 F Default 100 Platinum 385 2000t0 8500 1 3280 to 15620 200 t0 850 328 to 1562 0 to 16383 32768 to 32767 2009 Platinum 385 2000 to 6300 3280to 6300 200to 630 328t0 630 0 to 16383 32768 to 32767 1002 Platinum 3916 2000to 6300 3280 to 6300 200t0 630 328t0 4630 0 to 16383 32768 to 32767 2009 Platinum 3916 2000 to 6300 3280t0 6300 200t0 4630 328t0 630 0 to 16383 32768 to 32767 1209 Nickel 672 800 to 2600 3280 to 5000 80 to 260 328 to 500 0 to 16383 32768 to 32767 120Q Nickel 6181 1000to 2600 3280 t0 5000 100t0 4260 328t0 500 0 to 16383 32768 to 32767 109 Copper 426 1000 to 2600 3280t0 5000 100to 260 328t0 4500 0 to 16383 327
112. tenuated as shown in the following illustrations The cut off frequency for each input channel is defined by its filter frequency selection The table on page 3 5 shows the input channel cut off frequency for each filter frequency Choose a filter frequency so that your fastest changing signal is below that of the filter s cut off frequency The cut off frequency should not be confused with update time The cut off frequency relates how the digital filter attenuates frequency components of the input signal The update time defines the rate at which an input channel is scanned and its channel data word updated See page 3 10 for determining the channel update time Figure 3 3 28 Hz Filter Frequency Response ht tT TT tT a e ame PR Ba RE RET VE RS ENG LL LEE LL LL I dT EL DE UE ERA ERES I DE RE LLL dT EL LLLA ee n GAIN dB L LL Tt tT TT I TA L0 DL 1L LL ih tei LL ala LL PT TET TTT LL Lad Ulan I PET I ili 0 0 50 100 150 200 250 300 350 400 450 500 550 600 FREQUENCY Hz Publication 1746 UM003A EN P 3 8 Preliminary Operating Considerations Figure 3 4 50 60 Hz Filter Frequency Response Nt LII tt Wt tT LL LIII LL LA EI LL EL LI LLL LA Fi EEE Pit tt GAIN dB ih LL ala LL PM TE TTT LL Lad n I PET ili 0 88 176 264 352 440 528 616 704 792 880 968 1056 FREQUENCY Hz
113. ter for each channel calculate the RTD module update time interpret the RTD module response to slot disabling The module identification code is a unique number encoded for each 1746 I O module The code defines for the processor the type of I O or specialty module residing in a specific slot in the 1746 chassis To manually enter the module ID code select other from the list of modules on the system I O configuration display The module ID code for the RTD module is shown below Operating Class ID Code Class 1 3508 Class 3 12708 No special I O configuration information is required for Class 1 The module ID code automatically assigns the correct number of input and output words For Class 3 the user must assign the correct number of input and output words 16 and 24 Publication 1746 UM003A EN P 3 2 Preliminary Operating Considerations Module Addressing The memory map shown in the following illustration displays how the output and input image tables are defined for the RTD module Figure 3 1 Class 1 Memory Map Bit 15 Bit 0 Address Word 0 0 e 0 Word 1 0 e 1 Word 2 0 e 2 Channel 0 Con Channel 1 Configuration Word Channel 2 Configuration Word figuration Word Analog Input SLC 5 0X predia Channel 3 Configuration Word Word 3 Des Data Files Image Table Channel 4 Configuration Word Word 4 O e 4 Output Word 5 0 e 5 Word 6 0 e 6 Word 7 0 e 7 Output Channel 5 Configuration W
114. that new configuration information Therefore it is very important to verify that a dynamic channel configuration change took effect in the RTD module particularly if the channel being dynamically configured is used for control Example Execute a dynamic configuration change to channel 2 of the RTD module located in slot 3 of a 1746 chassis and set an internal data valid bit when the new configuration has taken effect Ladder Programming Examples Figure 5 5 Program to Verify Configuration Word Data Changes 5 5 Set up all eight NR8 configuration registers Registers N10 0 through N10 7 must be loaded with the appropriate configuration words prior to execution First Pass 1 COP 0000 q E Copy File 15 Source N10 0 Dest 0 3 0 Length 8 11 0 0 32 0001 C gt 0 8 This rung is used to verify the configuration word after a dynamic change Alarm bits can also be programmed in this rung to check for status errors EQU B3 0 0002 Equal Lp Source A 1 3 10 2 0 lt Source B 0 3 2 0 lt 0003 C END gt Interfacing to the PID The RTD module was designed to interface directly to the SLC 5 02 SLC 5 03 SLC 5 04 and SLC 5 05 PID instruction without the need for an Instruction intermediate scale operation Use RTD channel data as the process variable in the PID instruction To program this application proceed as follows 1 Select 100Q Platinum RTD a 0 003916 as the input type by sett
115. tion 1 10 Chapter 2 Compliance to Europe Union Directives 2 1 NIC Direetwe ak sales poeta ONE ren 2 1 Safety Considerations ses So XV NEN ee eee ne eee 2 2 Electrostatic Damage 1a cone teuren se see Are 2 2 Hazardous Location Considerations 2 2 Power Requirements iste sien as ee eMe AE peste ee 2 3 Module Location in Chassis oo ver ER D garen 2 4 Modular Chassis Considerations 2 4 Fixed Expansion Chassis Considerations 2 4 General Considerations 44 224 59 exem As ue Soie 2 5 Module Installation and Removal 25 uses an 2 5 Removing the Terminal Block 2 6 Installing the Module 242 220 2 ee 2 7 Removing the Module 5555 estat E nn 2 7 Terminal Wirne Senna ess aan ELLE EERE Ste nnd 2 8 Wiring Considerations nes or eae de aV de as 2 8 Wiring Resistance Devices Potentiometers to the Module 2 11 Wiring Input Devices to the Module 2 14 Calibration Salle Val BLA TA ee dub lito na 2 15 Factory Calibration sur VENE ae ERE 2 15 Atitocalibraioni sr laine pM CINES 2 15 Single Point Calibration cocer e pP TREE rina 2 16 Publication 1746 UM003A EN P Table of Contents ii Preliminary Operating Considerations Channel Configuration Data and Status Publication 1746 UMOO3A EN P Chapter 3 Module ID Codes ae Aa ER awe 3 1 Module Addressing eum to oso a a ali dal 3 2 Output Image
116. ture units bit in the configuration word bit 8 This feature is only active for RTD input types with the channel enabled This bit is cleared 0 if the channel is disabled or if the input type is a resistance device such as potentiometer Channel Configuration Data and Status 4 23 Channel Filter Frequency Bits 9 and 10 The channel filter frequency bit field reflects the filter frequency you selected in bits 9 and 10 of the configuration word when the channel is enabled This feature is active for all input types If the channel is disabled these bits are cleared 0 Channel Enable Status Bit 11 The channel enable status bit indicates whether the channel is enabled or disabled This bit is set 1 when the channel enable bit is set in the configuration word bit 11 and there is valid data in the channel s data word The channel status bit is cleared 0 if the channel is disabled Calibration Error Bit 12 If a calibration error occurs this flag is set A calibration error is a fatal error It indicates that the module was not able to complete its on board calibration process A calibration error could effect individual channels but may get set on all channels at the same time if the ADC has a hardware fault Broken Input Error Bit 13 This bit is set 1 whenever an enabled channel detects a broken input condition A broken input error is declared for the following reasons e Open circuit excitation current is le
117. ua a esto Be NT ee u ati 7 1 Channel Configuration 222m mean ee 7 1 Pros Erin an AU ee 7 2 Supplementary Example 22 22 22 dd ep Ess 7 3 Channel Configuration ii oSv ue ae ae 7 4 Program Setup and Operation Summary 7 6 Program Lisung nes a be 7 6 Appendix A Bleetrieal speciheationses ar Ger dio gu C eod iena A 1 Physical Specifications 3 0 0 ang Kastell A 1 Environmental Specifications 1 Denon pese tee eine A 2 Input Specifications score Keen RS RE A 2 Module Accuracy RTD Temperature Ranges Resolution and Repeatability A 3 RTD Accuracy and Temperature Drift Specifications A 4 Resistance Device Comipatibility wc sa at A 5 Cable Specifications c naar el en A a kl A 5 RID SEH en are A 5 Publication 1746 UM003A EN P Table of Contents iv Appendix B Configuration Worksheet for RTD Resistance Module Glossary Index Publication 1746 UM003A EN P Who Should Use This Manual Purpose of This Manual Preface Read this preface to familiarize yourself with the rest of the manual This preface covers the following topics e who should use this manual the purpose of this manual terms and abbreviations conventions used in this manual Allen Bradley support Use this manual if you are responsible for designing installing programming or troubleshooting control systems that use Allen Bradley small logic controllers You should have a basic understanding of SLC 500 pr
118. une 2000 2000 Rockwell International Corporation Printed in the U S A
119. ut Status Bits 6 and 7 6 22 veces es 4 22 Temperature Units Status Bit 8 0 5 360s e E 4 22 Channel Filter Frequency Bits 9 and 10 4 23 Channel Enable Status Bit 11 4 23 Calibration Error Bit 12 a eoa as Hann 4 23 Broken Input Error Bit 13 waste ae 4 23 Out Oft Ranese Error Bit 14 rs ovs edet eus ar 4 24 Configuration Error Bit 15 seri Vu aes E eK NS EE 4 24 Ladder Programming Examples Module Diagnostics and Troubleshooting Application Examples Specifications Table of Contents iii Chapter 5 Device Configuration aus cedat re echo e ode sar i dd 5 1 Initial Programming os oi NN 5 2 Dynamic Programming eis en RET ER re ERR eren 5 4 Verifying Channel Configuration Changes 5 4 Interfacing to the PID Instruction i emere y ERE 5 5 Using the Proportional Counts Data Format with the Usersset Scaling Class 3 93 3 eR RATER RS 5 7 Monitoring Channel Status Bits u 2222 Yes Areas aaa 5 8 Invoking Autocalibration xs feu ne RE Te 5 10 Chapter 6 Module Operation vs Channel Operation 6 1 Power Up Diagnostics see ee see 6 2 Channel Diagnostics rires faded ke he 6 2 LFI Indiestore se a sea ae 6 2 Error Codes nita a i Te 6 3 Channel Status LEDs Green 6 4 Module Status LED Green nr Jr ar 6 5 Replacement Parts unsre a 6 7 Contacting Rockwell Automation 211443 nei eds 6 7 Chapter 7 Basic Example su
120. wo signal levels digital filter A low pass noise filter incorporated into the A D converter In addition the digital filter provides high rejection notches at frequencies that are integral multiples of the filter cut off frequency The notches are used for rejecting AC power line noise and higher frequency noise Publication 1746 UM003A EN P Glossary 2 Publication 1746 UMOO3A EN P excitation current A user selectable current 0 25 mA and 1 0 mA that the module sends through the RTD or resistive device to produce an analog signal which the NR8 can process and convert to temperature or to ohms respectively effective resolution The amount of jitter data variation that typically occurs in the data word due to the influence of the internal electrical noise in the module filter frequency The user selectable stop band frequency for the A D converter digital filter The digital filter provides AC power line noise rejection when the first notch is at 10 Hz or at the power line frequency full scale error gain error The difference in slope between the actual and ideal potentiometer or RTD transfer functions full scale range FSR The difference between the maximum and minimum specified analog RTD or resistive input values gain drift The change in full scale transition voltage measured over the operating temperature range of the module input data scaling The data formats that you select to define the logical i
121. writing to the status file in your modular SLC processor you can disable any chassis slot Refer to your SLC programming manual for the slot disable enable procedure Input Response When an RTD slot is disabled the RTD module continues to update its input image table However the SLC processor does not read inputs from a module that is disabled Therefore when the processor disables the RTD module slot the module inputs appearing in the processor input image remain in their last state and the module s updated image table is not read When the processor re enables the module slot the current state of the module inputs are read by the processor during the subsequent scan Output Response The SLC processor may change the RTD module output data configuration as it appears in the processor output image However this data is not transferred to the RTD module when the slot is disabled The outputs are held in their last state When the slot is re enabled the data in the processor image is transferred to the RTD module Channel Configuration Chapter 4 Channel Configuration Data and Status This chapter examines the channel configuration word and the channel status word bit by bit and explains how the module uses configuration data and generates status during operation It gives you information about how to e configure a channel e examine channel input data e check a channels status The channel configuration word is a part
122. y the contents of integer file N10 to the eight consecutive output words of the RTD module beginning with O 3 0 To do this program a rung as shown below All elements are copied from the specified source file to the destination during the first scan following power up Publication 1746 UM003A EN P 5 4 Ladder Programming Examples First Pass Bit Initialize RTD module On power up bit S 1 15 is set for the first COP program scan and integer file N10 is sent to se t COPY FILE the RTD module channel configuration word 15 Source N10 0 Dest 0 3 0 Length 8 Dynamic Programming Rung 2 0 Rung 2 1 Rung 2 2 Verifying Channel Configuration Changes Publication 1746 UMOO3A EN P The ladder below explains how to change data in the channel configuration word when the channel is currently enabled Example Execute a dynamic configuration change to channel 2 of the RTD module located in slot 3 ofa 1746 chassis Change from monitoring the temperature in F to monitoring in C Figure 5 4 Program to Change Configuration Word Data Set up all eight channels 8 1 CGF E COPY FILE 15 Source N10 0 Dest 0 3 0 Length 8 Set channel 2 to display in C off or F on I 1 0 0 3 2 8 JEND When executing a dynamic channel configuration change there is always a delay from the time the ladder program makes the change to the time the RTD module gives you a data word using

1746-UM003A-EN-P, SLC 500 RTD/Resistance Input Module

Contents

Download Pdf Manuals

Related Search

Related Contents